This chapter explains how to create requesters, the information exchange
boxes that both the system and applications can use for confirming
actions, getting command options and similar operations.  These boxes are
called requesters because they generally request information from the user.

Alerts provide a function similar to requesters but are reserved for
emergency messages.  Alerts are discussed later in this chapter.

 types of requesters    easy requesters      alerts 
 true requesters        system requesters    function reference 
 requester structure