you cant run games from the network. once you launch an xbe any servers that are running are no longer in memory, so the conection will be lost.
for this to actually work, a server would have to be built into the kernel, not an external app (ie. x3cl). even if someone were to do this, there would be far too much overhead and a 128mb memory upgrade would likely be required. cpu usage would also be too great. a side from that the xbox cant multitask so im pretty sure even a kernel embeded server wouldnt work.