* SUPER POWER BUMP!!!* 
The URL location of the article that seemingly none of you wished to read
has changed:
http://www.informit.com/articles/article.asp?p=31697
It is an informative article written from quite a personal viewpoint (unusual for a science/engineering topic) ; however it results in a chatty informal style that makes light reading of a potentially dry subject which even 'NEWTS' should find rewarding. Go to it!
(No I don't get money for this! - You simply should be interested!
The part about the number of processes a simple window click calls on is humbling for want of a more apt word!
)