Answer / jeganath

PSDS is a program status data structure.
*PSSR is a subroutine to handle error occured in the program

Whenever there is error occured in the program, the status
defined in the PSDS get changed to some value based on type
of error,

at the same time the control transferred to *PSSR
subroutine , from there we can handle the error based on
the status value from PSDS.

we can rollback or we can modify/reset value based on
requirement

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