User`s guide

SET USR
(KMON)
Sets the state of USR (User Service Routine) swapping.
Format
SET USR condition
Condition
[NO]SWAP
SWAP, the default, allows the background job to place the USR (User Service
Routine) in a swapping state. This setting is not valid for mapped monitors.
This is the default mode for unmapped monitors.
NOSWAP locks the USR in memory so that it cannot be swapped.
274 RT–11 Command Descriptions