Designing Games with Game Maker - YoYo Games

Sometimes it is useful to get information about the position of the mouse on the display or to
change this position. For this the following functions exist:
display_mouse_get_x() Returns the x-coordinate of the mouse on the
display.
display_mouse_get_y() Returns the y-coordinate of the mouse on the
display.
display_mouse_set(x,y) Sets the position of the mouse on the display to
the indicated values.
The window
The actual game happens in a window. This window has a number of properties, like whether
it has a border, whether it is full screen, etc. Normally these are set in the Game Settings.
But you can change then during the game. The following functions exist for this:
window_set_visible(visible) Sets whether the game window is visible.
Clearly you normally want the window to remain visible during the whole
game. The program will not receive keyboard events when the window is
invisible.
window_get_visible() Returns whether the game window is visible.
window_set_fullscreen(full) Sets whether the window is shown in full
screen mode.
window_get_fullscreen() Returns whether the window is shown in full
screen mode.
window_set_showborder(show) Sets whether the border around the
window is shown. (In full screen mode it is never shown.)
window_get_showborder() Returns whether the border around the window
is shown in windowed mode.
window_set_showicons(show) Sets whether the border icons (iconize,
maximize, close) are shown. (In full screen mode these are never shown.)
window_get_showicons() Returns whether the border icons are shown in
windowed mode.
window_set_stayontop(stay) Sets whether the window must always stay
on top of other windows.
window_get_stayontop() Returns whether the window always stays on top
of other windows.