XPCOM documentation

[NeTDeMoN]

XPCOM needs documentation.

Especially needed:
-Making a new XPCOM interface(s)
-When to use COM and when to use ordinary classes
-The event (message) subsystem
-Other subsystems (your ideas here)
-Really detailed documentation about XPCOM made for both people with no COM
experience
and/or only minor COM experience. It could be written as a short form of Don
Box's book but with XPCOM
examples instead of MSCOM.

Please contribute documentation if you are experienced with XPCOM.