PS:
Scripting is done in
JScript (thus not Visual Basic). JScript is very similar to JavaScript, a language which is often used to script for websites.
JScript is Microsoft's version of JavaScript so to speak...
If you're new to JScript I also suggest to download the
official JScript documentation.
On top of the JScript language, Plus! adds many (powerfull) functions specific for Messenger and Messenger Plus!. Those added functions and how to work with them are described in the
official Plus! Scripting documentation, also linked to by albert in the previous post.
One of the best ways to learn (Plus!) scripting is learning from example. So,
download some (small) scripts and study their source while keeping the documentations alongside... Of course, start with small things...
More info can be found here:
http://www.msgpluslive.net/scripts/