(Change c:\myfiles to the location of where the pdf's
will be, note: the pdf's will be moved after merge & c:\mergedfiles)
3.
In Batch & Print Pro, go into Options menu-->Directory monitor setup and
configure folder to watch e.g. c:\mergedfiles and print.
4. Select "Run bat,exe before / after scan folder:"
Then enter c:\script.bat in the "File to
run:" box.

4. Check Directory monitor setup click "Trigger file monitoring:"
Enable source trigger file search.

Activate Directory monitor click "Activate Monitoring"
Click Add to List in directory monitor.
A screen shot below of all the setup in directory monitor.

5. Now to print, put some pdf files in c:\myfiles and
create a file called 'print' in c:\mergedfiles\, this is the trigger to merge and print the
files as one file.