call sswtch(swit, state)
SSWTCH tests bits 6-11 of the GCOS program switch word. This is only really of use in batch where these bits are set by options ON1 to ON6 on the $EXECUTE or $PROGRAM card. In TSS these bits have other meanings, and using them for controlling a program may have unexpected side effects. In batch, the ON1 bit (PSW bit 6) is used by the RLHS program, and so it should be avoided also.
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