I spent quite some time banging my head against the wall trying map an LPT port
for redirecting zebra labels within NAV.
NET USE LPT1: \\%computername%\sharename /persistent:yes
This works all day long logged in as administrator on an XP box, however Vista is a different beast.
Even running the Command Prompt as Administrator generated an error 66 network resource not found.
Well I was fortunate enough to attend a class at Lanham Associates and Per was our instructor.
We figured out Vista defaults the printer sharing on the Network Interface to off. If you enable File and Printer Sharing for Microsoft Networks, under properties, the NET USE command works like a charm.