.net - Internet Download Manager - Implementing a similar way of capturing downloads -

i've spent time writing own download manager , wish add download-capture functionality. want implement similar idm, seems detect http download requests within specified processes in order achieve this. make sure, took own software , added idm integration list, when request sent, got response:

http 1.0 - 204: intercepted idm advanced integration header pragma :no-cache header connection :close header cache-control :no-cache 

i know idm uses sort of network driver, , wondering how work? did implement kind of sniffer filters http requests? if so, can started on subject?

thanks.

i don't know exact answer question use free download manager open source download management application monitors ie , firefox , starts downloads if necessary . taking @ source might place start