Tested this on vanilla Win8. Swiping from "beyond" the right edge of the trackpad to ~1cm left from the right edge opens the Charms menu (same thing as Win+C shortcut or doing the same gesture on the touchscreen). Similar results (app switching) happen when swiping from the left edge.

This is a built-in Win8 feature, not a custom driver feature. The gesture recognition is quite decent though, so I've never had these gestures activate accidentally.