This tutorial of Jaime Rodriguez recaps the multitouch features in WPF 4, as of the Beta 2 release.
Multitouch is simply an abstraction from the OS (or a platform) that routes touch input to an application.
The OS exposes multitouch input with different levels of control and/or detail. For example, Windows 7 exposes multitouch data in three modes:
- Raw touch [...]
- Gestures [...]
- Manipulation and inertia.[...]