If you manage a Windows XP peer-to-peer network, you regularly need to be
able to find out who is remotely using files on a particular system. This
task probably makes you wish that Windows XP contained an updated version of
Net Watcher-that’s the neat utility in Windows 98 that showed you what files
were open and who was using them.

Unfortunately, Net Watcher never made it to the newer versions of the
Windows operating system. However, Windows XP does come with a command-line
tool called Openfiles.exe that performs the same function (even though it’s
not quite as snazzy as its GUI predecessor).

To use Openfiles, all you have to do is open a Command Prompt window and
type:

Openfiles [/parameter]

where /parameter is one of three settings that you can use to configure
Openfiles:

a.. /Disconnect: Disconnects one or more open files.
b.. /Query: Displays files opened locally or from shared folders.
c.. /Local: Enables/disables the display of local open files.
You can find detailed information about additional sub-parameters in the
Windows Help and Support Center.