The computer is something that only adult Tamas on V2 can use (not sure about Keitais, I mean if they have one or not..) and they just sit there and some of them press buttons for about 5 seconds.... not very worth money but.....yeah...
I heard that if you use the computer 25 times you get a full training bar.
I got my V2 only yesterday and I've already got a teenager, so I figured it would know how to use it, and bought one. BIG MISTAKE!! I have now found out that only adults can use it!!