VMS Help System Services, $SETAST  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Enables or disables the delivery of asynchronous system traps
    (ASTs) for the access mode from which the service call was
    issued.

    Format

      SYS$SETAST  enbflg

    C Prototype

      int sys$setast  (char enbflg);

1 - Argument

 enbflg

    OpenVMS usage:boolean
    type:         byte (unsigned)
    access:       read only
    mechanism:    by value
    Value specifying whether ASTs are to be enabled. The enbflg
    argument is a byte containing this value. The value 1 enables
    AST delivery for the calling access mode; the value 0 disables
    AST delivery.