When Format 3 of the SET statement is executed, the status of each external switch associated with the specified mnemonic-name is turned ON or OFF.
SET Statement - Format 3
.----------------------------------.
| .-----------------. |
V V | |
>>-SET------mnemonic-name-1-+--TO--+-ON--+-+-------------------><
'-OFF-'
For Format 3 each mnemonic-name must be associated with an external switch, the status of which can be altered. The only external switches allowed are the UPSI switches, UPSI-0 through UPSI-7.
The status of each external switch associated with the specified mnemonic-name is modified such that the truth value resultant from evaluation of a condition-name associated with that switch will reflect an on status if the ON phrase is specified, or an off status if the OFF phrase is specified.
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