public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int i, float a, float b, float c) {
		if( !(player instanceof EntityPlayerMP) )
			ModLoader.openGUI((EntityPlayerSP)player, new YourGUI([constructor args]));
		else
			ModLoader.serverOpenWindow((EntityPlayerMP)player, new YourGUIsContainer([constructor args]), YourGUIsID, x, y, z );
		return true;
	}