question: private SessionID startSession ( String localUserId , String remoteUserId ) throws Exception { if ( ! remoteUserId . contains ( "/" ) ) throw new Exception ( "can't start session without JabberID: " + localUserId ) ; SessionID sessionId = getSessionId ( localUserId , remoteUserId ) ; try { mOtrEngine . startSession ( sessionId ) ; return sessionId ; } catch ( OtrException e ) { OtrDebugLogger . log ( "startSession" , e ) ; showError ( sessionId , "Unable to start OTR session: " + e . getLocalizedMessage ( ) ) ; } return null ; }
target:  Start a new OTR encryption session for the chat session represented by a local user address and a remote user address.