Guido, I'm not certain I entirely agree - obviously you will need more than one display adaptor to use multiple displays, but Windows "knows" about the second (or more) display card(s). Mostly its invisible to applications that you have more than one display - windows simply extends the desktop to cover the multiple displays. I don't know what language PTE is written in, but in C or C++ you obtain include file multimon.h from Microsoft - more detail than I understand is at msdn.microsoft.com.... Obviously, if you only have a single display then applications are unchanged, but I believe its possible for an application to be aware (Microsoft use the expression multiple monitoraware) and use separate monitors. -Andrew