Get System Functions -- Overview                                            .
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 GETACTIVE()        Return the currently active Get object
 GETAPPLYKEY()      Apply a key to a Get object from within a Get reader
 GETDOSETKEY()      Process SET KEY during Get editing
 GETPOSTVALIDATE()  Postvalidate the current Get object
 GETPREVALIDATE()   Prevalidate a Get object
 GETREADER()        Execute standard READ behavior for a Get object
 READFORMAT()       Return, and optionally set, the format file code block   .
 READKILL()         Return, and optionally set, the READ terminate flag      .
 READUPDATED()      Return, and optionally set, whether a Get changed        .