The Ikarus 280 is the most successful and used urban-suburban articulated bus in the Ikarus Body and Vehicle Factory worldwide.

Doors opening / closing:

F1 / F2: 1 door open / close
F3 / F4: 2 door open / close
F5 / F6: 3 door open / close
F7 / F8: 4 door open / close
F9 / F10: Driver door open / close
Ctrl + F1 / Ctrl + F2: 1 skylight front open / close
Ctrl + F3 / Ctrl + F4: 1 skylight rear open / close
Ctrl + F5 / Ctrl + F6: 2 skylight front open / close
Ctrl + F7 / Ctrl + F8: 2 skylight rear open / close
Ctrl + F9 / Ctrl + F10: 3 skylight front open / close
Ctrl + F11 / Ctrl + F12: 3 skylight rear open / close
Shift + F1 / Shift+ F2: 4 skylight front open / close
Shift + F3 / Shift + F4: 4 skylight rear open / close
Shift + F5 / Shift+ F6: 5 skylight front open / close
Shift + F7 / Shift + F8: 5 skylight rear open / close

tutorial video: