trace routing question

From: alexk (alexk_at_mailinator.com)
Date: 12/26/04 

Date: 26 Dec 2004 12:39:54 -0800

I've a novice tracert/tracerout question:

Since the packet can take multiple routes each time, how does tracert
performs its job ? Is it running on top of TCP and establishes
predefined virtual circuit, so the packets with given TTL count will
travel each time same route ?

Any links to tracert explanation that consider this topic,
would be greatly appreciated - I couldn't find, by "googling" anything,
except repeated explanations about interpreting the command output.
Thank you great deal,
Alex

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