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                                          XEROX
                              INFORMATION PRODUCTS GROUP
                                   Systems Development Division
                                          July 22. 1977




                                                                  XEROX SDD ARCHIVES
To:       Tools Group                                         I have read and understood
                                                             Pages _________ To _________
From:     Bruce Parsley. SD/PARe
                                                           Reviewer         Date
Subject: Additional Hints about PNRs
                                                                                      '-----
                                                           , of Pages _ _ Ref. "ttl <;, DD ~ 281<,

Stored:   PNRsHints.memo




Here are some "hints" for tool writers concerning Processing Notification Routines
(PNRs). The material in this memo will be incorporated into the next release of the
TEX spec. You should read the material in that spec in section 5.2 (from about half
way down page 6 to the end of the section on page 7). This memo assumes a
familiarity with that material (and with some of the material in the Tool User Interface
(TUI) and Windows specs).

A tool writer should do something like the following:

          Somewhere in your tool, write one or more PNRs. They are normal Mesa
          procedures (subroutines) that must have calling sequences as specified by
          CursorPnrType or PbkPnrType.

          Now create a SubwindowObject. The routine CreateWindow makes one
          subwindow besides the window. The routines CreateSubwindow and
          EnlinkSubwindow may be used to get more subwindows in a window.

          You must create a PNRsObject. This may be done by declaring a (global)
          variable of that type or by using AllocateHeapNode.

          Then you should associate a PNRsObject with each of your subwindows. The
          way to do this is something like the following: mySubwindow.pnrs +- @myPNRs;

          Now you should fill each of the fields of each of your PNRsObjects. The
          encouraged method is to call one or more of the TVI routines that set up their             .'
          own PNRs in your subwindows' PNRsObjects. In Release 3.0 of the Tools

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