Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Operation
BOOLEANTAG_OPERATIONParameter: Resolve Self-Intersections
BOOLEANTAG_PREPROCESSParameter: Polygons
BOOLEANTAG_SELECTION_POLYGONParameter: BOOLEANTAG_SELECTION_POLYGON_NAME
BOOLEANTAG_SELECTION_POLYGON_NAMEParameter: Intersect Edges
BOOLEANTAG_SELECTION_INTERSECTParameter: BOOLEANTAG_SELECTION_INTERSECT_NAME
BOOLEANTAG_SELECTION_INTERSECT_NAME