Controls and OSM (On-Screen Manager)

OSM controls represent a part of 2490 advanced ergonomic solutions.
Controls are easily accessible, conveniet in use. Why convenient? They are mnemonic. They can be operated without looking at them. They are as hard to press as you need to feel them working, not more.
L-shape controls are intuitive. Left-Right and Up-Down buttons switch their roles when the monitor is in the Portrait position.