Find the display number of the tablet to use in the wtCintiq registry setting

1. Download and install EnumDisplayDevices
2. Download and install EnumDisplayMonitors
3. If needed run EnumDisplayMonitors from a command prompt to see a short list of display device IDs (see example 1 below)
4. Run EnumDisplayDevices from a command prompt and look for a display ID which is marked as "ATTACHED_TO_DESKTOP" (see example 2 below)
5. Use the appropriate display number for the wtCintiq registry entry, e.g. \\.\DISPLAY3

Example 1

   lpRect {0,0 1920,1080}
      rcMonitor = {   0,   0 1920,1080}
      rcWork    = {   0,   0 1920,1040}
      dwFlags   = 0x00000001 [MONITORINFOF_PRIMARY]
      szDevice  = \\.\DISPLAY1  

    lpRect {1920,0 3840,1080}
      rcMonitor = {1920,   0 3840,1080}
      rcWork    = {1920,   0 3840,1040}
      dwFlags   = 0x00000000 []
      szDevice  = \\.\DISPLAY2  

   lpRect {3840,0 4864,600}
      rcMonitor = {3840,   0 4864, 600}
      rcWork    = {3840,   0 4864, 560}
      dwFlags   = 0x00000000 []
      szDevice  = \\.\DISPLAY3

Example 2

    Name:   \\.\DISPLAY3
    String: Intel(R) HD Graphics
    Flags:  00000001 [ATTACHED_TO_DESKTOP]
    ID:     'PCI\VEN_8086DEV_016A\SUBSYS_1790103CREV_09'
    Key:    '\Registry\Machine\System\CurrentControlSet\Control\Video\{43767078-F844-4E74-9C90-E499C4F8E9B7}\0002'

    Number: 0
    Name:   \\.\DISPLAY3\Monitor0
    String: Generic PnP Monitor
    Flags:  00000003 [ATTACHED_TO_DESKTOP MULTI_DRIVER]
    ID:     'MONITOR\WAC1045\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001'
    Key:    '\Registry\Machine\System\CurrentControlSet\Control\Class\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001'