>Check MSDN for this function:
>GetVersionEx


Nope, that won't tell him, but VerifyVersionInfo() would. The OSVERSIONINFO doesn't have the necessary member to distinguish between XP Home and Pro. VerifyVersionInfo() uses an OSVERSIONINFOEX structure which contains a member that will (wSuiteMask). If this value is set to VER_SUITE_PERSONAL, then it's XP Home. Unfortunately, I have neither XP nor immediate access to the documentation (necessary header file) to be able to state the value of the constant nor test.