Release 10.1A: OpenEdge Development:
Progress 4GL Handbook

QUIT condition

Progress also supports a QUIT statement to terminate the application altogether. Progress raises the QUIT condition only when it encounters a QUIT statement. The default handling of the QUIT condition differs from STOP in these ways:

Progress commits, rather than undoes, the current transaction.
Even if the user specifies the –p startup option to define the main procedure in your application, it returns to the operating system rather than trying to rerun the startup procedure. In other words, Progress quits the session unconditionally.