diff --git a/src/main/kotlin/org/neoflock/neocomputers/entity/MachineEntity.kt b/src/main/kotlin/org/neoflock/neocomputers/entity/MachineEntity.kt
new file mode 100644
index 0000000..fc9d8bf
--- /dev/null
+++ b/src/main/kotlin/org/neoflock/neocomputers/entity/MachineEntity.kt
@@ -0,0 +1,32 @@
+package org.neoflock.neocomputers.entity
+
+import net.minecraft.core.BlockPos
+import net.minecraft.core.Direction
+import org.neoflock.neocomputers.item.ComponentItem
+import org.neoflock.neocomputers.network.Networking
+
+abstract class MachineEvent {
+    abstract val machine: MachineEntity
+}
+
+data class MachineRedstoneEvent(override val machine: MachineEntity, val side: Direction): MachineEvent()
+
+interface MachineEntity {
+    // Block position of machine, for wireless tech
+    fun getBlockPosition(): BlockPos
+
+    fun isRunning(): Boolean
+    fun start(): Boolean
+    fun stop(): Boolean
+    fun crash(error: String): Boolean
+
+    fun getMachineNode(): Networking.Node
+
+    // Redstone signals
+    fun getRedstoneInput(direction: Direction): Int
+    fun getRedstoneOutput(direction: Direction): Int
+    // returns the old one
+    fun setRedstoneOutput(direction: Direction, newValue: Int): Int
+}
+
+// TODO: add dummy machine class which implements the machine entity interface meant to be used on the client
\ No newline at end of file
diff --git a/src/main/kotlin/org/neoflock/neocomputers/gui/menu/CaseMenu.kt b/src/main/kotlin/org/neoflock/neocomputers/gui/menu/CaseMenu.kt
index 162beb6..4ad9d29 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/gui/menu/CaseMenu.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/gui/menu/CaseMenu.kt
@@ -1,5 +1,7 @@
 package org.neoflock.neocomputers.gui.menu;
 
+import net.minecraft.core.BlockPos
+import net.minecraft.core.Direction
 import net.minecraft.world.Container
 import net.minecraft.world.SimpleContainer
 import net.minecraft.world.entity.player.Inventory
@@ -9,12 +11,36 @@ import net.minecraft.world.inventory.AbstractContainerMenu
 import net.minecraft.world.inventory.MenuType
 import net.minecraft.world.item.ItemStack
 import org.neoflock.neocomputers.NeoComputers
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.gui.widget.ComponentSlot
 import org.neoflock.neocomputers.gui.widget.ComponentSlotRequirement
 import org.neoflock.neocomputers.gui.widget.DynamicSlot
+import org.neoflock.neocomputers.item.ComponentItem
+import org.neoflock.neocomputers.network.Networking
 import org.neoflock.neocomputers.utils.GenericContainerMenu
 
+// lowest IQ machine to exist
+class DumbMachine: MachineEntity {
+    override fun getBlockPosition() = BlockPos.ZERO!!
+
+    override fun isRunning() = false
+
+    override fun start() = false
+
+    override fun stop() = false
+
+    override fun crash(error: String) = false
+
+    override fun getMachineNode() = Networking.Node()
+
+    override fun getRedstoneInput(direction: Direction): Int = 0
+
+    override fun getRedstoneOutput(direction: Direction): Int = 0
+
+    override fun setRedstoneOutput(direction: Direction, newValue: Int): Int = 0
+}
+
 class CaseMenu : GenericContainerMenu {
     constructor(i: Int, inv: Inventory) : this(i, inv, SimpleContainer(7))
 
@@ -28,12 +54,12 @@ class CaseMenu : GenericContainerMenu {
     constructor(i: Int, inv: Inventory, container: Container) : super(Menus.CASE_MENU.get(), i, container) {
         this.addInventorySlots(inv, 8, 84)
 
-        this.addSlot(ComponentSlot(this.container!!, 0, 20, 34, eepromRequirement))
+        this.addSlot(ComponentSlot(this.container!!, 0, 20, 34, DumbMachine(), eepromRequirement))
 
         var i = 1
         for ((col, slotCol) in slotRequirements.withIndex()) {
             for ((row, slotReq) in slotCol.withIndex()) {
-                this.addSlot(ComponentSlot(this.container!!, i, 98+(col*22), 18*(row+1)-2, slotReq))
+                this.addSlot(ComponentSlot(this.container!!, i, 98+(col*22), 18*(row+1)-2, DumbMachine(), slotReq))
                 i++
             }
         }
diff --git a/src/main/kotlin/org/neoflock/neocomputers/gui/widget/ComponentSlot.kt b/src/main/kotlin/org/neoflock/neocomputers/gui/widget/ComponentSlot.kt
index 985b85a..05db6b8 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/gui/widget/ComponentSlot.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/gui/widget/ComponentSlot.kt
@@ -10,6 +10,7 @@ import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.level.ItemLike
 import org.neoflock.neocomputers.NeoComputers
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.item.ComponentItem
 
 // Sort of a mis-nomer, does not need to be associated with components specifically
@@ -84,7 +85,7 @@ data class ComponentSlotRequirement(val tier: Int, val role: String) {
 
 // Tier 0 allows ALL tiers, making it completely untiered.
 // Role determines what the role is.
-class ComponentSlot(container: Container, slot: Int, x: Int, y: Int, val requirement: ComponentSlotRequirement): DynamicSlot(container, slot, x, y) {
+class ComponentSlot(container: Container, slot: Int, x: Int, y: Int, val machine: MachineEntity, val requirement: ComponentSlotRequirement): DynamicSlot(container, slot, x, y) {
     override fun draw(graphics: GuiGraphics, relX: Int, relY: Int, mouseX: Int, mouseY: Int) {
         super.draw(graphics, relX, relY, mouseX, mouseY)
         if(!hasItem()) {
@@ -116,14 +117,14 @@ class ComponentSlot(container: Container, slot: Int, x: Int, y: Int, val require
         super.set(itemStack)
         val item = itemStack.item
         if(item is ComponentItem) {
-            item.whenComponentPlaced(itemStack, requirement.role)
+            item.whenComponentPlaced(itemStack, machine, requirement.role)
         }
     }
 
     override fun onTake(player: Player, itemStack: ItemStack) {
         val item = itemStack.item
         if(item is ComponentItem) {
-            item.whenComponentTaken(itemStack, requirement.role)
+            item.whenComponentTaken(itemStack, machine, requirement.role)
         }
         super.onTake(player, itemStack)
     }
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/CBUSItem.kt b/src/main/kotlin/org/neoflock/neocomputers/item/CBUSItem.kt
index a004be2..d633e2d 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/CBUSItem.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/CBUSItem.kt
@@ -2,6 +2,7 @@ package org.neoflock.neocomputers.item
 
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 
@@ -12,7 +13,7 @@ open class CBUSItem(val tier: Int, val maxComponents: Int): Item(Item.Properties
 
     override fun getComponentCapacity(itemStack: ItemStack): Int = maxComponents
 
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 }
 class CBUS0: CBUSItem(1, 8)
 class CBUS1: CBUSItem(2, 12)
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/CPUItem.kt b/src/main/kotlin/org/neoflock/neocomputers/item/CPUItem.kt
index 33e453d..c6c70db 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/CPUItem.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/CPUItem.kt
@@ -2,6 +2,7 @@ package org.neoflock.neocomputers.item
 
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 
@@ -12,7 +13,7 @@ open class CPUItem(val tier: Int, val maxComponents: Int): Item(Item.Properties(
 
     override fun getComponentCapacity(itemStack: ItemStack): Int = maxComponents
 
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 }
 
 class CPU0: CPUItem(1, 8)
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/ComponentItem.kt b/src/main/kotlin/org/neoflock/neocomputers/item/ComponentItem.kt
index 651348b..56da218 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/ComponentItem.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/ComponentItem.kt
@@ -1,6 +1,8 @@
 package org.neoflock.neocomputers.item
 
 import net.minecraft.world.item.ItemStack
+import org.neoflock.neocomputers.entity.MachineEntity
+import org.neoflock.neocomputers.entity.MachineEvent
 import org.neoflock.neocomputers.network.Networking
 import java.util.UUID
 
@@ -14,19 +16,28 @@ interface ComponentItem {
     fun getComponentCapacity(itemStack: ItemStack): Int = 0
 
     // Component placed, node must now exist
-    fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
-        val node = toComponentNode(itemStack) ?: return
+    fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
+        val oldNode = getComponentNode(itemStack)
+        if(oldNode != null) Networking.removeNode(oldNode) // did a mod forget to call whenComponentTaken?
+        val node = toComponentNode(itemStack, machine) ?: return
         Networking.addNode(node)
     }
 
     // Component taken, and thus removed
-    fun whenComponentTaken(itemStack: ItemStack, previousRole: String) {
-        val node = toComponentNode(itemStack) ?: return
+    fun whenComponentTaken(itemStack: ItemStack, machine: MachineEntity, previousRole: String) {
+        val node = getComponentNode(itemStack) ?: return
         Networking.removeNode(node)
     }
 
-    // To node, if applicable
-    fun toComponentNode(itemStack: ItemStack): Networking.Node?
+    // To node, if applicable. Meant to create the node, but not add it, as it will use the itemStack's address to find it again
+    fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node?
+
+    // Gets the node associated to an item, if it exists
+    fun getComponentNode(itemStack: ItemStack): Networking.Node? {
+        val address = itemStack.get(DataComponents.ADDRESS) ?: return null
+        val uuid = UUID.fromString(address) ?: return null
+        return Networking.getNode(uuid)
+    }
 
     fun ensureHasAddress(itemStack: ItemStack): UUID {
         if(!itemStack.has(DataComponents.ADDRESS)) {
@@ -34,4 +45,6 @@ interface ComponentItem {
         }
         return UUID.fromString(itemStack.get(DataComponents.ADDRESS))
     }
+
+    fun onMachineEvent(itemStack: ItemStack, machine: MachineEntity, event: MachineEvent) {}
 }
\ No newline at end of file
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/DataCard.kt b/src/main/kotlin/org/neoflock/neocomputers/item/DataCard.kt
index e187c7c..951da69 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/DataCard.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/DataCard.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 import org.neoflock.neocomputers.utils.Formatting
@@ -15,13 +16,13 @@ open class DataCard(val tier: Int, val limit: Long): Item(Properties()), Compone
 
     override fun getComponentTier(itemStack: ItemStack): Int = tier
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
-        super.whenComponentPlaced(itemStack, newRole)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
     // TODO: Modem Component
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
@@ -34,7 +35,7 @@ open class DataCard(val tier: Int, val limit: Long): Item(Properties()), Compone
             val addrComp = if(addr == null) Component.translatable("neocomputers.noaddr") else Component.literal(addr)
             list.addLast(addrComp)
             list.addLast(Component.translatable("neocomputers.data.limit", Formatting.formatMemory(limit)))
-            // TODO: show HTTP/TCP/TLS support
+            // TODO: show encryption support
         }
         super.appendHoverText(itemStack, tooltipContext, list, tooltipFlag)
     }
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/EEPROMItem.kt b/src/main/kotlin/org/neoflock/neocomputers/item/EEPROMItem.kt
index 2055ac2..66612c0 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/EEPROMItem.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/EEPROMItem.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 import org.neoflock.neocomputers.utils.Formatting
@@ -24,12 +25,12 @@ open class EEPROMItem(val tier: Int, val codeCapacity: Int, val dataCapacity: In
 
     override fun getComponentCapacity(itemStack: ItemStack): Int = 0
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
-        super.whenComponentPlaced(itemStack, newRole)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/GPUCard.kt b/src/main/kotlin/org/neoflock/neocomputers/item/GPUCard.kt
index ef667c6..b5541e4 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/GPUCard.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/GPUCard.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 
@@ -14,13 +15,13 @@ open class GPUCard(val tier: Int, val vram: Long): Item(Properties()), Component
 
     override fun getComponentTier(itemStack: ItemStack): Int = tier
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
-        super.whenComponentPlaced(itemStack, newRole)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
     // TODO: Modem Component
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/HDDItem.kt b/src/main/kotlin/org/neoflock/neocomputers/item/HDDItem.kt
index 87bcd5e..8b27cdf 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/HDDItem.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/HDDItem.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 import org.neoflock.neocomputers.utils.Formatting
@@ -22,12 +23,12 @@ open class HardDiskItem(val tier: Int, val capacity: Long): Item(getDiskProperti
 
     override fun getComponentCapacity(itemStack: ItemStack): Int = 0
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
-        super.whenComponentPlaced(itemStack, newRole)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/InternetCard.kt b/src/main/kotlin/org/neoflock/neocomputers/item/InternetCard.kt
index f597e07..51cd08e 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/InternetCard.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/InternetCard.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 import org.neoflock.neocomputers.utils.Formatting
@@ -13,13 +14,13 @@ class InternetCard: Item(Item.Properties()), ComponentItem {
 
     override fun getComponentTier(itemStack: ItemStack): Int = 1
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
-        super.whenComponentPlaced(itemStack, newRole)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
     // TODO: Internet Component
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/MemoryItem.kt b/src/main/kotlin/org/neoflock/neocomputers/item/MemoryItem.kt
index 9e8b2c1..9b381e2 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/MemoryItem.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/MemoryItem.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 import org.neoflock.neocomputers.utils.Formatting
@@ -17,12 +18,8 @@ open class MemoryItem(val tier: Int, val capacity: Int): Item(Item.Properties().
 
     override fun getComponentCapacity(itemStack: ItemStack): Int = 0
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {}
-
-    override fun whenComponentTaken(itemStack: ItemStack, previousRole: String) {}
-
     // no node for memory
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/NetworkCard.kt b/src/main/kotlin/org/neoflock/neocomputers/item/NetworkCard.kt
index e0191ef..512a2c0 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/NetworkCard.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/NetworkCard.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 
@@ -12,12 +13,13 @@ open class NetworkCard(val tier: Int, val maxRange: Int, val isWired: Boolean):
 
     override fun getComponentTier(itemStack: ItemStack): Int = tier
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
     // TODO: Modem Component
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/RedstoneCard.kt b/src/main/kotlin/org/neoflock/neocomputers/item/RedstoneCard.kt
index 14bee92..85bb387 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/RedstoneCard.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/RedstoneCard.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 
@@ -14,13 +15,13 @@ open class RedstoneCard(val tier: Int): Item(Properties()), ComponentItem {
 
     override fun getComponentTier(itemStack: ItemStack): Int = tier
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
-        super.whenComponentPlaced(itemStack, newRole)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
     // TODO: Redstone Component
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/item/TunnelCard.kt b/src/main/kotlin/org/neoflock/neocomputers/item/TunnelCard.kt
index 61fc235..2b07461 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/item/TunnelCard.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/item/TunnelCard.kt
@@ -4,6 +4,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.TooltipFlag
+import org.neoflock.neocomputers.entity.MachineEntity
 import org.neoflock.neocomputers.gui.widget.ComponentRoles
 import org.neoflock.neocomputers.network.Networking
 import org.neoflock.neocomputers.utils.Formatting
@@ -14,13 +15,13 @@ class TunnelCard: Item(Properties()), ComponentItem {
 
     override fun getComponentTier(itemStack: ItemStack): Int = 3
 
-    override fun whenComponentPlaced(itemStack: ItemStack, newRole: String) {
+    override fun whenComponentPlaced(itemStack: ItemStack, machine: MachineEntity, newRole: String) {
         ensureHasAddress(itemStack)
-        super.whenComponentPlaced(itemStack, newRole)
+        super.whenComponentPlaced(itemStack, machine, newRole)
     }
 
     // TODO: Tunnel Component
-    override fun toComponentNode(itemStack: ItemStack): Networking.Node? = null
+    override fun toComponentNode(itemStack: ItemStack, machine: MachineEntity): Networking.Node? = null
 
     override fun appendHoverText(
         itemStack: ItemStack,
diff --git a/src/main/kotlin/org/neoflock/neocomputers/network/Networking.kt b/src/main/kotlin/org/neoflock/neocomputers/network/Networking.kt
index 3d3713c..cddae74 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/network/Networking.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/network/Networking.kt
@@ -44,10 +44,10 @@ object Networking {
     class ComputerCheckedSignal(sender: Node, val player: String?, val name: String, val data: Array<Any>): Message(sender)
     class ComputerUncheckedSignal(sender: Node, val name: String, val data: Array<Any>): Message(sender)
 
-    open class Node {
+    open class Node(_address: UUID? = null) {
         val connections = mutableSetOf<Node>()
         private var reachableCache: Set<Node>? = null
-        open var address = UUID.randomUUID()
+        var address = _address ?: UUID.randomUUID()
 
         open var reachability = Visibility.NETWORK
         open var powerRole = PowerRole.CONSUMER
@@ -237,9 +237,7 @@ object Networking {
         }
     }
 
-    abstract class WirelessEndpoint : Node {
-
-        constructor(position: BlockPos);
+    abstract class WirelessEndpoint(address: UUID?) : Node(address) {
 
         abstract fun getRange(): Double
         abstract fun getDimension(): Int
@@ -249,7 +247,7 @@ object Networking {
     }
 
     val wirelessNodes = mutableSetOf<WirelessEndpoint>()
-    val allNodes = mutableSetOf<Node>()
+    val allNodes = mutableMapOf<UUID, Node>()
 
     // node may differ from message.sender in the case of relays,
     // as they might have DIRECT reachability but
@@ -281,18 +279,27 @@ object Networking {
     }
 
     fun tickAllNodes() {
-        allNodes.forEach { it.tick() }
+        allNodes.forEach { it.value.tick() }
         tickCount++
     }
 
+    fun getNode(address: UUID): Node? = allNodes[address]
+
+    // TODO: use setter, more convenient
+    fun changeNodeAddress(node: Node, address: UUID) {
+        allNodes.remove(node.address)
+        node.address = address
+        allNodes[address] = node
+    }
+
     fun addNode(node: Node) {
-        if(node in allNodes) return;
-        allNodes.add(node)
+        if(node.address in allNodes) return;
+        allNodes[node.address] = node
         if(node is WirelessEndpoint) {
             wirelessNodes.add(node);
         }
         // notify at the end so it is notified of its own creation
-        allNodes.forEach { it.onNodeAdded(node) }
+        allNodes.forEach { it.value.onNodeAdded(node) }
     }
 
     fun addNodes(vararg nodes: Node) {
@@ -300,14 +307,14 @@ object Networking {
     }
 
     fun removeNode(node: Node) {
-        if(node !in allNodes) return
-        allNodes.forEach { it.onNodeRemoved(node) }
+        if(node.address !in allNodes) return
+        allNodes.forEach { it.value.onNodeRemoved(node) }
         // toList() in order to copy it
         node.connections.toList().forEach {
             node.disconnectFrom(it)
         }
         // actually remove at the end so it can listen to its own removal
-        allNodes.remove(node)
+        allNodes.remove(node.address)
         if(node is WirelessEndpoint) {
             wirelessNodes.remove(node);
         }
diff --git a/src/main/kotlin/org/neoflock/neocomputers/network/PowerManager.kt b/src/main/kotlin/org/neoflock/neocomputers/network/PowerManager.kt
index 4f61238..7537b64 100644
--- a/src/main/kotlin/org/neoflock/neocomputers/network/PowerManager.kt
+++ b/src/main/kotlin/org/neoflock/neocomputers/network/PowerManager.kt
@@ -17,7 +17,7 @@ object PowerManager {
             entity, dir -> object : EnergyStorage {
                 override fun getAmount() = entity.node.energy
                 override fun getCapacity() = entity.node.energyCapacity
-                override fun supportsExtraction() = entity.node.powerRole != PowerRole.CONSUMER
+                override fun supportsExtraction() = entity.node.powerRole != PowerRole.CONSUMER && entity.node.energyCapacity > 0
                 override fun supportsInsertion() = entity.node.powerRole != PowerRole.GENERATOR
                 override fun extract(maxAmount: Long, transaction: TransactionContext?): Long {
                     if(entity.node.powerRole == PowerRole.CONSUMER) return 0