... but I think the original request is how to limit the uniface "filebox" function to local disks only ?? So we are talking about reimplementing a filebox dialog with the means of standard uniface language (aka a form).

Hi Hugo, Hiding Host Drives Microsoft's Group Policy Objects lets you hide specific host drives. For instructions, see http://support.microsoft.com/kb/231289. To hide host drives, the Apply Group Policy option must be enabled in the Cluster Manager’s Host Options dialog. Regards, Nico

I would suggest playing with WMI. A query to get you started is "SELECT * FROM WIN32_DiskDrive" which would return all of the information for all of the disk drives in your system. For example the PNPDeviceID field should start with USBSTOR for any USB drives. Check MSDN for what fields return. HTH Best Regards Claudio