We've run into a stumble. It seems most of the computers will not boot to the network. There is a selection in the BIOS to enable network boot, but without PXE, it's a no-go. So, I visited the Ubuntu LTSP documentation site, and found instructions for creating etherboot disks. Now we have to boot each computer from a Edubuntu LiveCd, find the type of Network Interface Card, look it up on ROM-o-matic, and create a CD or floppy boot disk to boot to the network.
An LTSP set up isn't easy. It will help keep older hardware in use, if we can get it to work right. This first setup we're doing will help us learn what to expect for the next network we create. Hopefully, the next setup will be easier.