MOUSEON leftbuttondown leftbuttonup rightbuttondown rightbuttonup move

Starts trapping mouse events that are sent to the "FMSLogo" window and passes them to leftbuttondown, leftbuttonup, rightbuttondown, rightbuttonup, or move, depending on the type of event. The callbacks may either be a word that is the name of a procedure to call, or a list of instructions to run. All "callbacks" for the mouse are automatically run in NOYIELD mode.

To obtain where the mouse was when a button was pushed or the mouse moved call MOUSEPOS in your button or move procedure.

PENUP
MOUSEON [SETPOS MOUSEPOS PENDOWN] [PENUP] [] [] [SETPOS MOUSEPOS]

Move the mouse around.
Hold down the left button to draw.

MOUSEOFF