Hi gastro54, welcome to CDFreaks!
If you have Nero 6 Burning ROM on your laptop pc (not Nero 7!) then you can install NeroNET on your desktop PC and configure Nero on your laptop pc so that you can burn to it over the network.
Behind the scenes an NRG image will be copied to the NeroNET pc before burning starts, however, so it’s more of a convenience - it doesn’t save much time.
There’s another solution based on iSCSI and Alcohol 120% that I haven’t tried.
A previous post claims that you can do it with DiscJuggler.
There’s also a solution similar to NeroNET for Linux systems and I think it’s open source. If you look for it you may be able to find the post here on CDFreaks, but I don’t remember the name of the Linux equivalent to NeroNET.
You could also share a folder from your laptop pc, and then mount it as a network drive on your desktop pc and burn the files or image from there. Unless you have Gigabit Ethernet, you shouldn’t attempt to burn any faster than 6x over the network.