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    GetDeviceProc -- Finds a handler to send a message to (V36)

    devproc = GetDeviceProc(name, devproc)
      D0                     D1     D2

    struct DevProc *GetDeviceProc(STRPTR, struct DevProc *)

    Finds the handler/filesystem to send packets regarding 'name' to.
    This may involve getting temporary locks.  It returns a structure
    that includes a lock and msgport to send to to attempt your operation.
    It also includes information on how to handle multiple-directory
    assigns (by passing the DevProc back to GetDeviceProc() until it
    returns NULL).

    The initial call to GetDeviceProc() should pass NULL for devproc.  If
    after using the returned DevProc, you get an ERROR_OBJECT_NOT_FOUND,
    and (devproc->dvp_Flags & DVPF_ASSIGN) is true, you should call
    GetDeviceProc() again, passing it the devproc structure.  It will
    either return a modified devproc structure, or NULL (with
    ERROR_NO_MORE_ENTRIES in IoErr()).  Continue until it returns NULL.

    This call also increments the counter that locks a handler/fs into
    memory.  After calling FreeDeviceProc(), do not use the port or lock

    name    - name of the object you wish to access.  This can be a
              relative path ("foo/bar"), relative to the current volume
              (":foo/bar"), or relative to a device/volume/assign
    devproc - A value returned by GetDeviceProc() before, or NULL

    devproc - a pointer to a DevProc structure or NULL

    Counter not currently active in 2.0.
    In 2.0 and 2.01, you HAD to check DVPF_ASSIGN before calling it again.
    This was fixed for the 2.02 release of V36.

    FreeDeviceProc(), DeviceProc(), AssignLock(), AssignLate(),

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