docs: function(jid_or_user_id) {
          var iqParams,
              builder,
              iq;
  
          iqParams = {
              'from': this.helpers.getUserCurrentJid(),
              'id': this.helpers.getUniqueId('lastActivity'),
              'to': this.helpers.jidOrUserId(jid_or_user_id),
              'type': 'get'
          };
  
          builder = Utils.getEnv().browser ? $iq : XMPP.Stanza;
  
          iq = chatUtils.createStanza(builder, iqParams, 'iq');
  
          iq.c('query', {
              'xmlns': chatUtils.MARKERS.LAST
          });
  
          if (Utils.getEnv().browser) {
              this.connection.sendIQ(iq);
          } else {
              this.Client.send(iq);
          }
      }