Users press the designated PF key, and OHF display the help message for the current feild. IF the cursor is outside a field, users get more general screen-level help. OHF is simple enough that users can and will create their own help windows. System support personnel will spend less time on support and don't need to make any changes to application programs. Installation OHF can be used in full, partial, or deactivated implementations.
Partial implementation runs without resident memory and needs only one user exit.
Deactivated implementation runs much like partial implementation, but requires a few lines of code in the applications it supports. It is useful for applications to be installed at multiple locations, some of which do not otherwise support OHF, or for forcing a help window onto a screen without the user's request. Environment Use OHF with CICS 1.7 or greater and any 3270-type terminal or 3270 emulator. Full operation of OHF requires one or more CICS user exits and 300 bytes of resident memory plus 9 bytes for each terminal in the region. Limited operation is possible, however, without user exits and resident memory.