???? ????? ??. ?? ???? ???? ????? ?? ??? ??? ?????+ ??? ?? ???? ????, ? ???? ???? ?? ?? ??? ???? ??? ???? ?? ???? ??? ? ??.??? ?????? ?? [???? ?? ??]?? ??? ??????.?? ??? ? ? ?? ? ?? ?????. ???? ??? ?? ?? ?? ??? ?? ???? ??? ????? ?.A shared whiteboard enables you to attract, graph features, compose sophisticated equations and share files. Audio and