ArcCommand keys

Z - Left
X - Right

H - Fire

J - Thrust
K - Brake

F - Eject left
G - Eject right

F1 - Rotation clamp on
2 - Rotation clamp off
F2 - Velocity clamp on
2 - Velocity clamp off

End - Freeze
Delete - Unfreeze

RISC OS and Windows only
F5 - Music off
F6 - Music quiet
F7 - Music louder
F8 - Music loudest

RISC OS only
Print - Screensave to Ram:$.ArcCmd