X-Midas Users Take Note:
Since host primitives are unable to handle NeXtMidas ID's (which are strings) all messages from a host primitive will be sent to the same location as specified by the /MSGID= switch passed to the host primitive. By default /MSGID= is set to null, to see the messages in the processMessage procedure of a macro use /MSGID=MAIN.
(This applies to XBC only, not NeXtOpt.)