Either you pass parameters in the query string portion of the web url, so in your example you have did=37&module=2&tocfilter=15&view=2&
which is a series of key value pairs which gives
did=37
module=2
tocfilter=15
view=2
or they are posted in the HTTP header. You'll need an HTTP sniffer tool to investigate further. I used Fiddler at http://www.telerik.com/fiddler and it is quite good.