This tutorial provides step-by-step instructions about how to install the free VMware Server (version 1.0.2) on a Debian Etch system. With VMware Server you can create and run guest operating systems (virtual machines) such as Linux, Windows, FreeBSD, etc. under a host operating system. This has the benefit that you can run multiple operating systems on the same hardware which saves a lot of money, and you can move virtual machines from one VMware Server to the next one (or to a system that has the VMware Player which is also free). In this article we use Debian Etch (4.0) as the host operating system.

http://www.howtoforge.com/debian_etch_vmware_server_howto