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Is this the correct syntax for the script editor?

actor_to_screen(&xmouse, &ymouse) //convert mouse coordinates to screen coordinates.

What use would this have in a game or program?
TIA

You can use screen_to_actor(&xmouse, &ymouse); to convert the mouse coordinates to the current actor coordinates. You can use this to draw in the right place in a canvas actor.

Use actor_to_screen to convert from actor coordinates to screen coordinates