As little as possible. <g> Don't leave yourself in key 0 because you're going to need it again in 20 instructions. Get in and get out. Five years from now some other programmer may introduce a branch out in the middle of your 20 instructions, with potentially unhappy results.
Comment the code to help reduce the above possibility: **************************************************** *************** Entering key 0 ********************* **************************************************** *************** Exiting key 0 ********************** Desk check, desk check, desk check. Don't use key 0 simply because it is easier or simpler to code than using some particular non-8 key. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Scott Ford Sent: Sunday, July 12, 2015 8:57 AM To: [email protected] Subject: Re: SYSTEM KEY Programming Was: IVSK and SPKA With all the discussion, what's the safest way to use key=0 , if it is required ? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
