I have 8 different VM's with different OSes, in order to test that the setup works on all versions of Windows. The host (running VMWare Server 2.0.2) however doesn't have enough RAM to run all of them at once.
(currently, I've only configured 2 of them)
I pass the switch /pipelineCount:1 and it says "Starting 1 parallel installation(s) (2 max)..."
Then it connects twice, opens both VM's, restores the snapshots (both) and powers on the two machines simultaneously, which eventually leads to a time out (restoring two running machines at once takes a while).