A cluster, for anyone wondering, in general terms, is a group of connected computers that work together to complete a task.
Step 1: Materials
4 Apple computers. I used G5 Intel imacs but you can use any Apple computer.
4 Category 5 Ethernet cables
1 10/100Mbps Ethernet switch (minimum 4 ports)
1 key board and mouse
In my case, I got all of the imac because they had broken/missing screens. All you need then is a monitor, VGA cable, and VGA adapter depending on the type of port on your Apple.
Step 2: Hardware
Then power everything up.
Step 3: Software
Click to download the appropriate version onto one computer. Since my imacs were running OSX 10.5 I used the second download.
Open the folder that you have downloaded called "PoochDemoInstaller". Inside click on the "Pooch Installer" and run it to download Pooch onto your computer.
Next drag and drop the "PoochDemoInstaller" folder onto the USB and copy it onto each of your other three computers and run the "Pooch Installer" on each.
The free version of Pooch only allows you to run 4 computer clusters, but you can buy software from Dauger Research that will incorporate as many computers as you are willing to pay for.