Train
1. Computer training is the process of learning the knowledge and skills relating to computers or a product relating to a computer. In the below link is a full listing of training and informational starting points on Computer Hope.
2. In a MMORPG a train refers to a one or more players who have multiple hostile creatures chasing them but is running because they're unable to handle them all. Often this player is either running to a zone where they'll be able to find safety or far enough to where the creatures return back to their original location. This is called a train because it looks like a train when the player is running with four or more creatures following them.
Also see: CBT, Certification definitions, Game definitions