Setting up a Control message

I've found out that the communication to the CanoScan 4200F
scanner
most likely happens through control messages. And I've tried
to set up
my program to emulate this, but with my limited knowledge of
how USB
communication works. 

I'd like to how to set up a control msg. But what are
requestType / 
request / index / value parameters to usb_control_msg() used
for?

And where in a usbsniffer.log would they likely be noted?

High hopes
René Kjellerup
-- 
-- as life grows older, I gain experience.

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