What are Red Hat Enterprise "virtualization technologies"?
From http://www.redhat.com
RHEL 5 offers an open source virtualization application built into the OS.
RHEL Advanced Platform (large companies):
Unlimited virtualized guests
RHEL 5 Server (small companies):
Up to 4 virtualized guests
RHEL 5 Desktop with Multi-OS option:
Up to 4 virtualized guests