SHARE Presentation: Migrating to z/OS V1R4, Parts 1 and 2 - pages 74-75, at http://docs.share.org/proceedings/sh100/s2871.pdf.

z/OS V1R4 Migration: Section 5.1.3 - Modify programs that check the CVT and ECVT for operating system name and level, at http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/e0z2m101/5.1.3.