def instances(self, ident):
        """ gets the instances id of an operation, matching the ident """
        agents = self._call_get('agent')
        # instances: [{u'status': u'open', u'scout': False, u'good': True, u'name': u'avtagent_desktop_windows_elite_silent (1)', u'platform': u'windows', u'demo': False, u'_kind': u'agent', u'stat': {u'grid_size': 183088, u'last_sync': 1386874247, u'source': u'172.20.20.151', u'user': u'avtest', u'device': u'AVTAGENT', u'last_sync_status': 0, u'size': 34599}, u'upgradable': False, u'instance': u'7f198461c7ce800381480345cc5d8617b3015c89', u'ident': u'RCS_0000057058', u'version': 2013103102, u'path': [u'51224a314e091305b800005d', u'52a895cc4e0913f2e600b406'], u'_id': u'52aa04d14e0913a56300c604', u'type': u'desktop', u'desc': u'made by vmavtestat at Thu Dec 12 19:46:32 2013'}]
        # pp.pprint(agents)