You do not say which operating system.Ideally,
1. During boot up process, connect to the network server with supplied username and password. (maybe in a text file?)
2. Map the desired network volumes.
3. Make aliases of the said network volumes, and put them in the workstation's hard disk, NOT volumes mounted on the desktop.
If that makes any sense whatsoever.
Normal AppleShare behaviour supports this without anything extra except for the part about it not appearing on the desktop.
1. when selecting volume in Chooser, select to have volume mounted at startup time.
2. make an alias to volume, put on harddisk and rename to whatever you want.