Check the third <br />

portal/portal-chat/tool/src/java/portal-chat.properties:
portal-chat.action.latestData = The URL format is "/direct/portal-chat/ANYTHING/latestData.json?online=true&siteId=SITEID". <br/> \
Grabs all the latest data for the currently logged in user. This operation will also optionally set the heartbeat for the current user.<br/> \
If you don't want to show up in chattable lists, pass false for online and you'll be hidden from others. The latestData operation retrieves your connections <br /> \
, your messages, and, if you specify a siteId parameter, the list of users currently in that site.