Allegro Consultants, Inc., does not make the Allegro remote control...Zenith does.
Unfortunately, like too many companies, Zenith seems to believe that it should hide its history ... it's removed the web page that had instructions for the remote control (formerly at www.zenith.com/how2_program.html). I have been unable to locate any programming information at the Zenith site after 1999.
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However, the World Wide Web is wonderful...
A search for "allegro remote control" at www.yahoo.com shows a number of sites.
I checked one, and it looks pretty good:
NOTE: I recommend trying several sites. I've noticed that there are minor discrepancies between many of the code lists.