I have added Tapatalk accessibility for these SG boards. This means that the first time you attempt to view these boards from a mobile device, you will get a message to try Tapatalk. You do not need to do this and the 'check out Tapatalk' message should only appear the first time you try to connect via a mobile device.
Basically, its an app that you access from an iPhone/iPad, Android phone, Blackberry or Nokia. The app has a directory of forums registered with it. You can look through them, find your favourite - TacCmd and SG, obviously - and post and access the forum through the app.
The app has a paid version which is fully functional, and a free version which only lets you read. You don't have to use the app, and aside from the initial message, you shouldn't notice any difference if you don't use it.