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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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