NAME
    CloseDevice - terminates access to the narrator device

SYNOPSIS
    CloseDevice(IORequest)
                   A1

FUNCTION
    Close invalidates the IO_UNIT and IO_DEVICE fields in the
    iorequest block, preventing subsequent io until another
    opendevice.  closedevice also reduces the open count.  if
    the count goes to 0 and the expunge bit is set, the device
    is expunged.  If the open count goes to zero and the delayed
    expunge bit is not set, CloseDevice sets the expunge bit.

INPUTS
    A valid iorequest block with its io_message structure, and
    io_Device and io_Unit fields properly initialized.  These
    fields are initialized by opendevice.

RESULTS
    CloseDevice invalidates the unit and device pointers in the
    iorequest block.

SEE ALSO