This is activated whenever an exec'd process produces output to its standard output channel. The process number is the number assigned by exec to the process (see HELP exec). The parameters to this function are:
$0 The process number that activated the on
If the EXEC was called with exec -name <process name>
then $0 matches this name instead. This is very useful
for keeping the processes separated out.
$1- The line of output to stdout