Nur Teil des Bildschirmes benutzen..

; WinUser.h
Global Const $SPI_SETWORKAREA                = 0x002F
Global Const $SPI_GETWORKAREA                = 0x0030


Global Const $SPIF_UPDATEINIFILE             = 0x0001
Global Const $SPIF_SENDWININICHANGE          = 0x0002
Global Const $SPIF_SENDCHANGE                = $SPIF_SENDWININICHANGE


_SetWorkArea(0,0,800,600)
While 1
WEnd


Func _SetWorkArea ($iLeft = -1, $iTop = -1, $iRight = -1, $iBottom = -1)
    Local $aResult, $rect = DllStructCreate ("int[4]"), $pRect = DllStructGetPtr ($rect)


   ; Change -1's
   If $iLeft = -1 Then $iLeft = 0
   If $iTop = -1 Then $iTop = 0
   If $iRight = -1 Then $iRight = @DesktopWidth + 0
   If $iBottom = -1 Then $iBottom = @DesktopHeight + 0


   ; Set struct data
   DllStructSetData ($rect, 1, $iLeft  , 1)     ;left
   DllStructSetData ($rect, 1, $iTop   , 2)     ;top
   DllStructSetData ($rect, 1, $iRight , 3)     ;right
   DllStructSetData ($rect, 1, $iBottom, 4)     ;bottom


   ; Set the area
    $aResult = DllCall("user32.dll", _
                      "int", "SystemParametersInfo", _
                      "int", $SPI_SETWORKAREA, _
                      "int", 0, _
                      "ptr", $pRect, _
                      "int", $SPIF_SENDCHANGE)


    If @error Then Return SetError(@error, 0, False)
    Return $aResult[0] <> 0
EndFunc ; ==> _SetWorkArea