What different between using "threshold" and "track" for rule and flow-portscan ??

[Lerdpong Lerdpaisarnwong <lerdpong () hotmail com>]

Hey everyone, I'm newbies. I used snort for detecting scanning worms which its characteristics is send packets  from 
source to many destinations to find victims so I used flow-portscan preprocessor to detect them  but then I read manual 
I found that I  can write rule that using "threshold" and "track"  . For example,alert icmp any any -> any any (msg: 
"Alert for scan worm" ; threshold: type threshold, track by_src, count 100 , seconds 1;) Does anyone know the different 
between them ?? RegardsJO
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