Hot Corners
We've lauded Microsoft on numerous occasions (and chided it beforehand) for instituting Hot Corners, which activate the Charms bar when mousing into the upper-right and the application switcher in the upper-left. In essence, this function returns mouse users from Windows 8 exile but provides minimal additional functionality beyond access to basic operating functions. These include access to system settings and some devices, finding, sharing and launching files, and switching between running apps. We can only guess at why Microsoft chose to make only the corners hot instead of the entire right and left sides. It might be easier just to memorise a few keyboard shortcuts:
Charm bar: Start-C
Search: Start-Q
Share: Start-H
Settings: Start-I
Devices: Start-K