Mark Valentine wrote in a message to All:

 MV> I need a way to deny file access to other processes and
 MV> users while a separate process updates a data file. I'd like
 MV> to do this from a REXX script. Can anyone show me how to do
 MV> this, or at least point me to the right reference? 

Just open the file with STREAM:

   call stream 'FILENAME.TXT', 'C', 'open write'
   /* file is owned by your process here */
   call stream 'FILENAME.TXT', 'C', 'close'
 
-- Mike


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