Live Meeting client is client software for both integration with OCS server and LYNC server. No LYNC attendee client unfortunately, Live Meeting is initiated by default.
An improvement to use LYNC client was implemented since SPLMS 18.104.22.168. When SPLMS integration with LYNC was configured on a server, Live Meeting client was used by default when users joined a conference from a course. Now we support LYNC client and it will be the default one for joining a LYNC conference from a course.
For SharePoint 2013-based SPLMS versions LYNC 2013 with LYNC Web App are supported.