3.1.1.1 Touch Contact State Transitions
The following finite state machine diagram describes the states through which a contact involved in a touch or pen transaction can transition during its lifetime.

Figure 2: Lifetime of a touch or pen contact
A contact transitions through three main states:
Out of Range
Hovering
Engaged
When a contact is in the "hovering" or "engaged" state, it is referred to as being "active". "Hovering" contacts are in range of the digitizer, while "engaged" contacts are in range of the digitizer and in contact with the digitizer surface. The Remote Desktop Protocol: Input Virtual Channel Extension remotes only active contacts and contacts that are transitioning to the "out of range" state; see section 2.2.3.3.1.1 for an enumeration of valid state flags combinations.
When transitioning from the "engaged" state to the "hovering" state, or from the "engaged" state to the "out of range" state, the contact position cannot change; it is only allowed to change after the transition has taken place.