This terminal command can be used to invoke an interactive helproutine.
%J is used after interrupting the
playback of a recording, the playback will be resumed after the helproutine has
been executed (refer to the section
Utility in the Utilities
%J is used when a function invoked by a
system command is active, Natural will search for the specified helproutine in
the active library of the system command or in a library that has been defined
as a steplib for the system command.