diff --git a/common/src/main/java/fr/username404/snowygui/mixins/EndTickMixin.java b/common/src/main/java/fr/username404/snowygui/mixins/EndTickMixin.java
new file mode 100644
index 0000000..eb83978
--- /dev/null
+++ b/common/src/main/java/fr/username404/snowygui/mixins/EndTickMixin.java
@@ -0,0 +1,20 @@
+package fr.username404.snowygui.mixins;
+
+import fr.username404.snowygui.EventSnowy;
+import net.minecraft.client.Minecraft;
+import org.jetbrains.annotations.NotNull;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(Minecraft.class)
+public class EndTickMixin implements EventSnowy {
+	@NotNull
+	@Override
+	public String getType() {
+		return "EndTick";
+	}
+	@Inject(method = "tick", at = @At("RETURN"))
+	public void endTick(CallbackInfo ci) { fire(); }
+}
diff --git a/common/src/main/java/fr/username404/snowygui/mixins/KeyMappings.java b/common/src/main/java/fr/username404/snowygui/mixins/KeyMappings.java
index f262abb..0829381 100644
--- a/common/src/main/java/fr/username404/snowygui/mixins/KeyMappings.java
+++ b/common/src/main/java/fr/username404/snowygui/mixins/KeyMappings.java
@@ -1,6 +1,7 @@
 package fr.username404.snowygui.mixins;
 
 import com.google.common.collect.Lists;
+import fr.username404.snowygui.config.AddKeyMaps;
 import net.minecraft.client.KeyMapping;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.Options;
@@ -8,13 +9,15 @@ import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Mutable;
 import org.spongepowered.asm.mixin.Shadow;
-import fr.username404.snowygui.config.AddKeyMaps;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 import java.io.File;
-import java.util.*;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
 
 @Mixin(Options.class)
 class KeyMappings {
@@ -28,7 +31,8 @@ class KeyMappings {
 		List<KeyMapping> newKeys = Lists.newArrayList(keyMappings);
 		for (KeyMapping key : keysToAdd) {
 			if (!categoryMap.containsKey(key.getCategory())) {
-				Optional<Integer> biggest = categoryMap.values().stream().max(Integer::compareTo); int biggestInt = biggest.orElse(0);
+				Optional<Integer> biggest = categoryMap.values().stream().max(Integer::compareTo);
+				int biggestInt = biggest.orElse(0);
 				categoryMap.put(key.getCategory(), biggestInt + 1);
 			}
 			newKeys.remove(key);
diff --git a/common/src/main/kotlin/fr/username404/snowygui/EventSnowy.kt b/common/src/main/kotlin/fr/username404/snowygui/EventSnowy.kt
new file mode 100644
index 0000000..30f3b46
--- /dev/null
+++ b/common/src/main/kotlin/fr/username404/snowygui/EventSnowy.kt
@@ -0,0 +1,16 @@
+package fr.username404.snowygui
+
+interface EventSnowy {
+    val type: String
+    fun <T> fire(vararg args: T?) {
+        useKey(type).forEach {
+            it(args)
+        }
+    }
+    companion object {
+        fun useKey(key: String): MutableSet<argsLambda> { return eventMap.getOrPut(key, ::mutableSetOf) }
+        private val eventMap: MutableMap<String, MutableSet<argsLambda>> = mutableMapOf()
+    }
+}
+
+internal typealias argsLambda = (args: Array<*>) -> Unit
\ No newline at end of file
diff --git a/common/src/main/kotlin/fr/username404/snowygui/Snowy.kt b/common/src/main/kotlin/fr/username404/snowygui/Snowy.kt
index f2c47e9..242fb68 100644
--- a/common/src/main/kotlin/fr/username404/snowygui/Snowy.kt
+++ b/common/src/main/kotlin/fr/username404/snowygui/Snowy.kt
@@ -1,14 +1,29 @@
 package fr.username404.snowygui
 
+import fr.username404.snowygui.EventSnowy.Companion.useKey
+import fr.username404.snowygui.config.AddKeyMaps
 import org.apache.logging.log4j.LogManager
 import org.apache.logging.log4j.Logger
 
 abstract class Snowy {
     companion object {
+        fun onEvent(e: String, lambda: argsLambda) {
+            useKey(e).add(lambda)
+        }
         @JvmStatic
         val logs: Logger = LogManager.getLogger()
     }
+    private fun eventsInit() {
+        onEvent("EndTick") {
+            for (Key in AddKeyMaps.list.keys) {
+                if (Key.isDown) {
+                    AddKeyMaps.list[Key]?.invoke()
+                }
+            }
+        }
+    }
     fun atInit() {
         logs.info("Init point of SnowyGUI hit.")
+        eventsInit()
     }
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/fr/username404/snowygui/SnowyScreen.kt b/common/src/main/kotlin/fr/username404/snowygui/SnowyScreen.kt
new file mode 100644
index 0000000..79d37fc
--- /dev/null
+++ b/common/src/main/kotlin/fr/username404/snowygui/SnowyScreen.kt
@@ -0,0 +1,8 @@
+package fr.username404.snowygui
+
+import net.minecraft.client.gui.screens.Screen
+import net.minecraft.network.chat.TranslatableComponent
+
+internal class SnowyScreen: Screen(TranslatableComponent("screen.snowy.gui")) {
+
+}
\ No newline at end of file
diff --git a/common/src/main/kotlin/fr/username404/snowygui/config/AddKeyMaps.kt b/common/src/main/kotlin/fr/username404/snowygui/config/AddKeyMaps.kt
index 866a494..490f97d 100644
--- a/common/src/main/kotlin/fr/username404/snowygui/config/AddKeyMaps.kt
+++ b/common/src/main/kotlin/fr/username404/snowygui/config/AddKeyMaps.kt
@@ -1,7 +1,9 @@
 package fr.username404.snowygui.config
 
 import com.mojang.blaze3d.platform.InputConstants
+import fr.username404.snowygui.SnowyScreen
 import net.minecraft.client.KeyMapping
+import net.minecraft.client.Minecraft
 import org.lwjgl.glfw.GLFW.GLFW_KEY_U
 import org.lwjgl.glfw.GLFW.GLFW_KEY_Y
 
@@ -15,7 +17,7 @@ object AddKeyMaps {
         ) to lambda
     }
     val list: MutableMap<KeyMapping, (() -> Unit)?> = mutableMapOf(
-        mkMap("opengui", GLFW_KEY_Y),
-        mkMap("configkey", GLFW_KEY_U)
+        mkMap("opengui", GLFW_KEY_Y) { Minecraft.getInstance().setScreen(SnowyScreen()) },
+        mkMap("configkey", GLFW_KEY_U) { Minecraft.getInstance().setScreen(SnowyConfigScreen()) }
     )
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/fr/username404/snowygui/config/ConfigScreen.kt b/common/src/main/kotlin/fr/username404/snowygui/config/ConfigScreen.kt
index 60f5cab..9ff5025 100644
--- a/common/src/main/kotlin/fr/username404/snowygui/config/ConfigScreen.kt
+++ b/common/src/main/kotlin/fr/username404/snowygui/config/ConfigScreen.kt
@@ -3,6 +3,6 @@ package fr.username404.snowygui.config
 import net.minecraft.client.gui.screens.Screen
 import net.minecraft.network.chat.TranslatableComponent
 
-abstract class SnowyConfigScreen: Screen(TranslatableComponent("screen.snowygui.config")) { // TODO Actual config screen
+open class SnowyConfigScreen: Screen(TranslatableComponent("screen.snowygui.config")) { // TODO Actual config screen
 
 }
\ No newline at end of file
diff --git a/common/src/main/resources/assets/snowygui/lang/en_us.json b/common/src/main/resources/assets/snowygui/lang/en_us.json
index 59065af..531debe 100644
--- a/common/src/main/resources/assets/snowygui/lang/en_us.json
+++ b/common/src/main/resources/assets/snowygui/lang/en_us.json
@@ -1,4 +1,5 @@
 {
+  "screen.snowy.gui": "Snowy Interface",
   "screen.snowy.config": "Snowy configuration screen",
   "category.snowy.keycategory": "SnowyGUI",
   "key.snowy.opengui": "Open the snowy gui",
diff --git a/common/src/main/resources/assets/snowygui/lang/fr_fr.json b/common/src/main/resources/assets/snowygui/lang/fr_fr.json
index 464658f..e52e999 100644
--- a/common/src/main/resources/assets/snowygui/lang/fr_fr.json
+++ b/common/src/main/resources/assets/snowygui/lang/fr_fr.json
@@ -1,4 +1,5 @@
 {
+  "screen.snowy.gui": "Interface de Snowy",
   "screen.snowy.config": "Configuration de snowy",
   "category.snowy.keycategory": "SnowyGUI",
   "key.snowy.opengui": "Ouvrir l'interface de snowy",
diff --git a/common/src/main/resources/snowygui-mixins.json b/common/src/main/resources/snowygui-mixins.json
index 2384447..a0f5268 100644
--- a/common/src/main/resources/snowygui-mixins.json
+++ b/common/src/main/resources/snowygui-mixins.json
@@ -4,7 +4,8 @@
   "compatibilityLevel": "JAVA_8",
   "client": [
     "KeysAccessor",
-    "KeyMappings"
+    "KeyMappings",
+    "EndTickMixin"
   ],
   "injectors": {
     "defaultRequire": 1