IDS vs Application Proxy Firewall

[maash.rajani () gmail com]

Can someone please explain how is an IDS different from an application proxy firewall in terms of what each of them 
looks for in a packet.

------------------------------------------------------------------------
Test Your IDS

Is your IDS deployed correctly?
Find out quickly and easily by testing it 
with real-world attacks from CORE IMPACT.
Go to http://www.coresecurity.com/index.php5?module=Form&action=impact&campaign=intro_sfw 
to learn more.
------------------------------------------------------------------------