First, to do anything, the computer must have Windows NT/2000 running with port 139 open.

net use \\IP ADDRESS\IPC$ " " /u: " "

Use your imagination from there.
Its not very common anymore since the service packs for NT have made it easier to turn off null sesions.

For those who find it too hard to type all that (whew!) I've attatched RedButton for your enjoyment.

:o) Have a nice day!