user and computer whenChanged/modifyTimeStamp properties

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From: MadDHatteR (blah_at_example.com)
Date: 06/12/04 

Date: Sat, 12 Jun 2004 03:08:13 -0700

What events trigger an update the the whenChanged and modifyTimeStamp
properties of user and computer accounts in AD? MSDN suggests these are
updated when the object is changed, with no further explanation. I would
expect failed (or successful) logins to modify this, as well as password
resets, user-initiated password changes, etc. as these all require
modification to one or more of the object's properties. However,
failed/successful logins apparently do NOT update whenChanged -- I haven't
looked closer at password changes. So, what DOES whenChanged measure?

modifyTimeStamp appears to be identical to whenChanged. Is it different (and
how)?

Thanks,
\\ MadDHatteR