ndi.setup.yangyangwang

  ndi.setup.vhlab - initialize an ndi.session.dir with VHLAB devices

   S = ndi.setup.vhlab(REF, DIRNAME, [FORCE])

   Initializes an ndi.session.dir object for the directory
   DIRNAME with the standard compliment of VHLAB devices, as
   found in ndi.setup.daq.system.vhlab.

   If the devices are already added, they are not re-created.

   If the devices are already added, they are not re-created unless
   FORCE is provided and is 1.