Hi chanklaus, being neither a windoze or Tk person, I am not sure if there is any wisdom in this, but I found this script for retreiving the list of mapped drives in a windows box - maybe it will help you answer your "and/or"?

 ---------------------------------------------------------------
# Adapted from VBScript code contained in the book:
#      "Windows Server Cookbook" by Robbie Allen
# ISBN: 0-596-00633-0
# ---------------------------------------------------------------

use Win32::OLE qw(in);
$Win32::OLE::Warn = 3;

$strComputer = '.';
$objWMI = Win32::OLE->GetObject('winmgmts:\\\\' . $strComputer . '\\ro
+ot\\cimv2');
$colDrives = $objWMI->ExecQuery('select * from Win32_MappedLogicalDisk
+');
print "Mapped Drives:\n";
foreach my $objDrive (in $colDrives) {
    print ' Device ID: ' . $objDrive->DeviceID, "\n";
    print ' Volume Name: ' . $objDrive->VolumeName, "\n";
    print ' Session ID: ' . $objDrive->SessionID, "\n";
    print ' Size: ' . $objDrive->Size, "\n";
    print "\n";
}
[download]

Although what you want to do sounds like it should be a common enough task that there would exist somewhere a more elegant ( and tested ) solution like you wanted!