If it is on a Windows PC, then you can set up an appropriate entry in the Send To menu, which is available via the right-click context menu.
Exactly how it is set up depends on which flavour of Windows you are running, but the principle is the same in each case:
[ul]
[li]Create a batch file containing the required command, but with '%1' instead of the filename.
For a parallel port device on LPT1 this would be
copy /b %1 LPT1:
For a network connected device this would be:
lpr -S<IP-address> -P<queue> %1
where <IP-address> and <queue> are appropriate to the target device.[/li]
[li]Save this batch file; the location is immaterial, but it might be an idea to create a special folder for 'SendTo' scripts.[/li]
[li]Create a shortcut to the batch file, and save it in the current SendTo folder; where this is depends on which version of windows you are using.
For Windows XP, this would be the C:\Documents and Settings\username\SendTo folder (where username represents your user name.
(For some reason I've yet to find, it doesn't work if placed in the folder for All Users).[/li]
[/ul]