@begin(header)
author: ackerman@ics.uci.edu
show_author: ShowNone
author_organization: MIT
expiration_date: 07/03/93
last_modifier: ackerman@ics.uci.edu
last_mod_date: 07/03/91
mod_num: 1
@end(header)
@b<Widget writing>

If you are trying to write a new widget (or understand an old one), are
you concerned with 
@button(the subclassing effort,Xt_Subclassing)
or, 
@button(the widget internal code,Xt_Writing)
