That sounds like a job for UDMonitor, a third party product that will manage multiple cache slots. I can run several workunits in sequence and logon to the internet and sent them in one after the other at the same time.

I have two setups on fast AMD computers with 30 slots each, enough for about 5 days of work. That means that I can also be processing workunits if the WCG servers are down for some reason. Each slot is a different device name.

http://udmon.sourceforge.net/

The documentation is written for grid.org. There is only one small difference in function. When starting UDMonitor, a WCG bat file found in the UDMonitor directory must be used.

Search threads for UDMonitor or UD Monitor. There is also extensive information about it in member-to-member support on the http://grid.org forum.

If you are running with BOINC, that has a workunit queuing ability on its own without using UDMonitor.