Tandy 1000 Programmer's Reference Manual page 17

Chapter 1 I
System Calls
Terminate Address
Interrupt 22H
When a program terminates, control transfers t o the ad-
dress at offset OAH of the Program Segment Prefix. This
address is copied into the Program Segment Prefix from
the Interrupt 22H vector when the segment is created.
You can set this address using Function Call 25H.
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