[GD-Windows] ActiveX Control question

[Brian H. <bri...@gm...>]

I've been reading up on ActiveX control development, and I'm looking
for a good book that covers ActiveX in depth (as opposed to the books
out there that spend 1000 pages on MFC and then devote 50 pages to an
ActiveX clock example written using MFC/ATL).  Any suggestions?

I also have a specific question:  is there a proper way to implement a
control that is completely passive, i.e. accepts no input and just
does something.  Imagine an application that allows you to download an
OCX to perform a bunch of calculations and then upload the results
(kind of like SETI at home, but as an explicit Web page control, not
as an explicit downloadable).

The typical control reacts to events, e.g. with OnXXXX response. 
Should I just setup a timer that periodically calls a callback
function, or is there a better/cleaner weay?