VMS Help DEALLOCATE, Examples  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    1.$ DEALLOCATE  DMB1:

      In this example, the DEALLOCATE command deallocates unit 1 of
      the RK06/RK07 devices on controller B.

    2.$ ALLOCATE   MT:   TAPE
      %DCL-I-ALLOC, _MTB1:  allocated
         .
         .
         .
      $ DEALLOCATE  TAPE:

      In this example, the ALLOCATE command requests that any
      magnetic tape drive be allocated and assigns the logical
      name TAPE to the device. The response to the ALLOCATE command
      indicates the successful allocation of the device MTB1. The
      DEALLOCATE command specifies the logical name TAPE to release
      the tape drive.

    3.$ DEALLOCATE/ALL

      In this example, the DEALLOCATE command deallocates all devices
      that are currently allocated.