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The PDK_ values inform the system when a mouse event is being generated by pen movement, as well as the current state of any barrel buttons. This information is contained in the wPDK and wPdk members of the STROKEINFO and PENPACKET structures, respectively. The GetPenAsyncState function also accepts a PDK_ value as its only argument. The following table lists the PDK_ values:

Constant	Value	Description
PDK_NULL	0x0000	No flags set (default).
PDK_UP	0x0000	Same as PDK_NULL.
PDK_BARREL1	0x0002	Barrel button 1 is depressed.
PDK_BARREL2	0x0004	Barrel button 2 is depressed.
PDK_BARREL3	0x0008	Barrel button 3 is depressed.
PDK_DOWN	x0001	Pen is in contact with the tablet.
PDK_SWITCHES	0x000F	All of the above.
PDK_TIPMASK	x0001	Mask for testing PDK_DOWN.
PDK_TRANSITION	0x0010	Only has meaning if set by pen services. This bit is set if the first point in the sequence being returned is in a different pen-tip state (up or down) from the previous points returned. If set on a call to AddPointsPenData, a new stroke is created even if the previous call to AddPointsPenData appended points of the same pen state. By default, a sub-sequent call to AddPointsPenData adding points of the same state as the previous call appends the points to the last stroke instead of creating a new stroke.
PDK_EVENT	0x0010	Alias for PDK_TRANSITION.
PDK_PENIDMASK	0x0F00	Mask for bits 811 (see paragraph following table).
PDK_INVERTED	0x0080	Pen is upside down ("eraser" end is in contact with tablet).
PDK_INKSTOPPED	0x2000	Inking has stopped.
PDK_OUTOFRANGE	0x4000	Set if the tablet detects the pen leaving the range of detection. If set, other information in the packet is invalid.
PDK_DRIVER	0x8000	Set if event is generated by the pen driver (as opposed to the mouse driver).

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