>We are not familiar with Win32 API calls. Is there an easy way to use these in VFP? Do you know where I can find sample code for the WNetGetUser() function?
>

Using API calls is not difficult; the basic process is to declare the entrypoint to the .DLL, telling VFP what types of parameters to use, and then call the .DLL, passing appropriate parameters. There are numerous examples on using the API here on UT. A simple example of how WNetGetUser() would work might be:

DECLARE INTEGER WNetGetUser IN WIN32API ;
   STRING @ lpName, ;
   STRING @ lpUsername, ;
   INTEGER @ lpnLength

cDriveName = 'Z:' + CHR(0)  && the drive you want to check on
cBuffer=SPACE(200) && where the username will be returned
nLength = LEN(cBuffer) && the size of the buffer
nResult = WNetGetUser(cDriveName, @cBuffer, @nLength)
IF nResult = 0
   *  it worked, and the buffer contains the name
   ?  'UserID for the Drive Z: mapping - ' + LEFT(cBuffer, AT(CHR(0),cBuffer) - 1)
ELSE
   *  it did not work, lots of possible reasons
   *  You can determine the exact reason from the return value
   *  see the MSDN documentation for the meaning of the error codes
ENDIF

I'd strongly recommend that you get the MSDN documentation; it's provided when you purchase Visual Studio, or you can purchase an annual subscription that will provide quarterly updates to the CDs at a minimum. The documentation can also be accessed on-line via MSDN OnLine, a free service from Microsoft (http://msdn.microsoft.com).

If you don't intend to learn much about using APIs, you might well be better off buying a commercial library like NETLIB, which hide most of the details of using the APIs, and have been tailored to providing support for VFP.