What is DFHAID? what is its use?

Answer Posted / thomas vt

DFHAID is an attention identifier. it is a group of keys
from F1 - F24(PF1-PF24) and A1 - A4 keys, along with ENTER
key and ESC key(for clear). we can set appropriate
functions for each key in a program by writing it inside an
EVALUATE keyword.
eg: EVALUATE DFHAID
WHEN PF1 perform exit
WHEN PF2 display 'hai'
WHEN OTHER display 'invalid key'
END-EVALUATE.

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