Aloha, all. Tried a search and couldn't find exactly what I needed.

Moving to Singapore this week (can't believe I'm leaving Hawaii). Will travel mostly on UA/TG/SQ. I am star gold and RCC member. I know I can bring a guest into a *G lounge with the *G status. However, as a RCC member(If I wasnt *G) and flying a non UA *A carrier (SQ/TG) can I also bring a guest in? Further, does being a member of RCC allow you into certain lounges that *G doesn't? Thanks for the help...