Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Redraw
HAIR_TOOL_DYNAMICS_REDRAW
Parameter: Time
HAIR_TOOL_DYNAMICS_TIME
Parameter: Dynamics
HAIR_TOOL_DYNAMICS_DYNAMICS
Parameter: Collisions
HAIR_TOOL_DYNAMICS_COLLISIONS
Parameter: Gravity
HAIR_TOOL_DYNAMICS_GRAVITY
Parameter: Stiffness
HAIR_TOOL_DYNAMICS_STIFFNESS
Parameter: Forces
HAIR_TOOL_DYNAMICS_FORCES
Parameter: Reset
HAIR_TOOL_DYNAMICS_RESET