I got myself a little button to start playing around with. Attempting to hook it up to a Rpi.
What I wanted to confirm was the purpose and pins for each wire. The button I got is http://www.robotgear.com.au/Product.aspx/Details/782-Button-Module-with-cable
Some confusion was caused for me by G V N S..... I'm guessing G=Ground V=Active N=Neutral S=Dito Close up with GVNS http://www.robotgear.com.au/Cache/Files/ProductImageOriginals/2233_Button%20module%20with%20cable.jpg
After speaking with a friend who has more experience with this stuff. We're assuming this configuration
G = Pin 6 Ground
V = Pin 4 5V
S = Pin 11 or GPIO