Either draw a sprite or print somethins to the mouse location:
LOADSPRITE "MyPointer.bmp", 12
start:
MOUSESTATE mx, my, b1, b2
SPRITE 12, mx, my
SHOWSCREEN
GOTO start
or:
start:
MOUSESTATE mx, my, b1, b2
PRINT "X", mx, my
SHOWSCREEN
GOTO start
Have fun,
Gernot