Multiple Boot OS - Linux - Windows

Hello, I need to know please if what I am proposing is possible and what the reliability may be like etc.
I have 4 Machines, I have one server and 3 workstations, Currently Windows Server 2003 is present on the

server and the workstation are using Windows XP Professional + SP2.

I would like to install a multiboot on these 4 machines, On the server I would like to install Ubuntu

Server then on the workstations Ubuntutu workstation version, these will be the 6.06 version of Ubuntu.

I am doing this for testing purposes and eventually possibly switching completely to Linux for a network

although having both at the same time would be prefered. Being able to use Linux on all the machines

selected at boot up or perhaps a windows server with linux workstations and then a linux server with

windows workstations would be brilliant for learning and testing purposes.

This is not a mission critical network as it were just a family network, Also as an extra I would also like

to install FreeBSD as a 3rd boot option on the server and PCBSD on the workstations, Hard drive space is

not an issue I just wish to know this is doable and workable.

Thanks you very much

P:S - I would rather understand this before activly doing it :)