Works on 3.3; doesn't work on 3.7, except when run from rexx.exe rather than regina.exe
For some commands, the output disappears. For some, the output goes to the screen. For some, it works as designed. Following are my test program and its output (run 3 times different ways).
parse version b
say "parse version output:" b
address system 'DIR' with output stem dirtrap.
address system 'HELP HELP' with output stem helptrap.
address system 'zip -v' with output stem ziptrap.
11:29 Mon 2013-11-25 D:\utils\Regina\Regina37>regina f:with
parse version output: REXX-Regina_3.7(MT) 5.00 14 Oct 2012
Provides help information for Windows 2000 commands.
command - displays help information on that command.
11:29 Mon 2013-11-25 D:\utils\Regina\Regina37>rexx f:with
parse version output: REXX-Regina_3.7 5.00 14 Oct 2012
11:30 Mon 2013-11-25 D:\utils\Regina\Regina37>