The system copy buffer.

	// Simple editor Window that lets you have more than 1 saved "copy" command
	
	class EditorGUISystemCopyBuffer extends EditorWindow {
	
		var savedCopies : String[] = new String[5];
		var load = false;
		
		@MenuItem("Examples/Improved copy buffer")
		static function Init() {
			var window = GetWindow(EditorGUISystemCopyBuffer);
			window.Show();
		}
		
		function OnGUI() {
			load = EditorGUILayout.Toggle("Load:", load);
			EditorGUILayout.BeginHorizontal();
			for(var i = 0; i < savedCopies.Length; i++)
				if(GUILayout.Button(i.ToString()))
					if(load)
						EditorGUIUtility.systemCopyBuffer = savedCopies[i];
					else
						savedCopies[i] = EditorGUIUtility.systemCopyBuffer;
			EditorGUILayout.EndHorizontal();
			
			for(var j = 0; j < savedCopies.Length; j++)
				EditorGUILayout.LabelField("Saved " + j, savedCopies[j]);
			
			EditorGUILayout.LabelField("Current buffer:", EditorGUIUtility.systemCopyBuffer);
			if(GUILayout.Button("Clear all saves"))
				for(var s : String in savedCopies)
					s = "";
		}
		
		function OnInspectorUpdate() {
			this.Repaint();
		}
	}