The dynamic allocation program--terminal operation

When transaction ADYN is entered at a terminal, the operator is presented with a formatted display. The top part of the display is for entering commands, the bottom part for receiving messages from the program.

The operator types a command in TSO-like syntax, for example,

verb {keyword[(value...)]}...

and presses the ENTER key. The program checks the command for correct syntax, builds a DYNALLOC parameter list, and, if no serious errors are detected, issues a DYNALLOC SVC. Messages are then displayed to diagnose syntax errors, give the DYNALLOC return codes, and show any values returned by DYNALLOC information retrieval features. The command remains on the display, and the editing features of the terminal can be used to correct it for reentry, or to enter a different command.

If there are too many messages to fit into the message area of the screen, messages that cannot be displayed are queued, and the messages already on the screen are displayed with a brighter intensity to indicate that there are more messages to come. The operator can correct those errors that are being displayed, and reenter the command for further checking, when the queued messages, if any, are regenerated.

The program is terminated by entering a null command, which consists of pressing the ERASE INPUT key, followed by the ENTER key. PA keys 1 and 2 are ignored by the program. If you press the CLEAR key, you redisplay the last command entered. Pressing a program function key is equivalent to pressing ENTER.

Related concepts
Overview of the dynamic allocation program
Related tasks
Installing the program and transaction definitions
Using the dynamic allocation program’s Help feature
Related reference
The dynamic allocation program--values
The flow of control when a DYNALLOC request is issued
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