keyboard_check_direct - GameMaker
keyboard_check_direct. This function will return true if the key with the particular keycode is pressed, or false if it is not, by checking the hardware directly. It allows for a few more checks, in particular you can use keycodes vk_lshift, vk_lcontrol, vk_lalt, vk_rshift, vk_rcontrol and vk_ralt to check whether the left or right shift, control or alt key is pressed.