Connecting a laptop to desktop

I have a Dell Dimension desktop and an Ibm T22 Laptop.
Both use Windows 98. I just got a D-Link 604 Router. So
far I have been able to share the internet with both. I
have also been able to get files from the laptop to the
desktop. The thing I can't do is get files from the
desktop to the laptop or share the printer. When I
doubleclick the OEMWorkgroup(desktop) nothing happens. The
computer is not recognized. Does anybody know what needs
to be done? Do I have to set up some kind of networking
account on the laptop?