gadgets and menus do much of the work of getting commands and option
choices from the user.  Sometimes though, an application needs to get
further information from a user in response to a command which has already
been initiated.  In that case, a requester can be used.  A requester is a
temporary sub-window, usually containing several gadgets, used to confirm
actions, access files, or adjust the special options of a command the user
has already given.

     figure 2-5: an intuition requester 

Requesters are discussed in detail in Chapter 7,
"intuition requesters and alerts".  additional information on programming
requesters for Release 2 of the system can be found in Chapter 16,
"asl library".