Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Type
PAGE_TYPE
Parameter: Relative T1
PAGE_T1
Parameter: Relative T2
PAGE_T2
Parameter: Absolute T1
PAGE_ABST1
Parameter: Absolute T2
PAGE_ABST2
Parameter: Animation Time
IN_PAGE_ATIME
Parameter: On
OUT_PAGE_ON