Looking for info on Flowbits

[dajackman <robby.lists () gmail com>]

I am interested in reading more about the flowbits option.  I have
poked around a little on the net and haven't satisfied my curiosity. 
Does any one know a good writup/doc on the flowbit and or the flow
preprocessor.  What started my search was trying to understand how the
below rule works.  Thanks for any help


alert tcp any any <> any !$SSH_PORTS (msg: "BLEEDING-EDGE POLICY SSH
session in progress on Unusual Port"; flowbits: isset,is_proto_ssh;
threshold: type both, track by_src, count 2, seconds 300;
classtype:misc-activity; sid: 2001984; rev:4; )


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