#include <GuiConstantsEx.au3>

Opt("MouseCoordMode", 1)        ;1=absolute, 0=relative, 2=client ******* Very Important ********

Global $ycalc = .90 * @DesktopHeight
Global $Xcalc = .90 * @DesktopWidth

HotKeySet("{ESC}", "Terminate") ; a way out of this

While 1
    Sleep(50)
    _MGP()
WEnd

Func _MGP()
    $pos = MouseGetPos()
    If $pos[1] > $ycalc Or $pos[0] > $Xcalc Then Return ToolTip('X: ' & $pos[0] & ', Y: ' & $pos[1], 10, 10)
    ToolTip('X: ' & $pos[0] & ', Y: ' & $pos[1])
EndFunc   ;==>_MGP

Func Terminate()
    Exit 0
EndFunc   ;==>Terminate