>We have a client who has a peer to peer network using W2K Professional. Can I expect my apps (7.0) to work just like they do on W2K Server based network? What problems or challenges might I encounter?

Yes in general, but no, in a number of ways that will affect the administration of the network. While shared resources are addressed using UNCs and mapping, you'll have to create accounts for each user on each machine, since no authentication services are really available. You also have some interesting issues regarding the allocation of shared resources; you are inherently limited to a total of 10 sessions of simultaneous access to any given system - this means that if you have two shares on a machine that are needed, one a printer and the other a folder, you're not going to be happy when user #6 tries to go in, and it can be rather obnoxious about refusing to drop what might otherwise be considered a dead session pending an explicit logout. You have relatively limited control over how the OS allocates its resources; you're basically limited to favoring the foreground process.