HP 3000 Manuals

HP ALLBASE/4GL Developer Self-Paced Training Guide

Summary 

There are five types of messages.  Each has a different effect on the
application.  The five message types are:

        Type                              Description 

MESS                  Message only.

QUERY                 The user must enter a response.

WARN                  Warning only, message plus terminal bell.

ERROR                 The user must take action to continue.

ABORT                 The application terminates when the user presses
                      Return.

A message can be constructed from a number of items.  Most messages will
have a literal component.  You can also include communication area
fields, variables, file fields, screen fields, and other items.

MPE/iX 5.0 Documentation