>Hello all!
>
>Looks like sysmetric is not enough to garanty a good definition of of the maximum height and maximum width of a screen.
>
>I have those definitions
>
>thisform.width = SYSMETRIC(1) - SYSMETRIC(3) - SYSMETRIC(12)
>thisform.Height = SYSMETRIC(2) - SYSMETRIC(4) - SYSMETRIC(13) - SYSMETRIC(29)
>
>What am I missing?
You may want to also find out the Height of the taskbar at the bottom, and add it to the height of the screen:

TaskBarHeight()
Function TaskBarHeight
Declare Integer GetWindowRect In user32;
   INTEGER HWnd, String lpRect
Declare Integer FindWindow In user32;
   STRING lpClassName,;
   STRING lpWindowName

Local cBuffer
 cBuffer = Replicate(Chr(0), 16)
 hWindow= FindWindow('Shell_TrayWnd', '')
 cRect = GetWinRect(hWindow)
 ?  "The height of the taskbar is: "+trans(buf2dword(Substr(cRect, 13,4))-buf2dword(Substr(cRect, 5,4)))
Function GetWinRect(hWindow)
Local cBuffer
 cBuffer = Replicate(Chr(0), 16)
 = GetWindowRect(hWindow, @cBuffer)
Return cBuffer
Function buf2dword(lcBuffer)
Return Asc(Substr(lcBuffer, 1,1)) + ;
   BitLShift(Asc(Substr(lcBuffer, 2,1)),  8) +;
   BitLShift(Asc(Substr(lcBuffer, 3,1)), 16) +;
   BitLShift(Asc(Substr(lcBuffer, 4,1)), 24)