anchor.diff:  :: us find the name of the new device.
   ::
   :: Note:
  -::  - While we could limit the search to devices having ServiceName=tap0901,
  +::  - While we could limit the search to devices having ServiceName=%DEVICE_HWID%,
   ::    that will cause wmic to output just "no instances available" when there
   ::    are no other TAP devices present, messing up the diff.
   ::  - We do not use findstr, etc., to strip blank lines because those ancient tools
  
positive.code: type "%BEFORE_DEVICES%"
  
  echo Creating TAP network device...
  tap-windows6\tapinstall install tap-windows6\OemVista.inf tap0901
  if %errorlevel% neq 0 (
    echo Could not create TAP network device. >&2
    exit /b 1
  
negative.code: @echo off
  
  set DEVICE_NAME=outline-tap0
  set DEVICE_HWID=tap0901
  
  :: Check whether the device already exists.
  netsh interface show interface name=%DEVICE_NAME% >nul
  