node.js - How to create two clients if using RedisStore? -

i'm trying implement redis pub/sub, , want use redis in order store sessions. how can create 2 clients 1 store ? found how make 1 client store:

app.use(express.session({         secret: 'mysecret',         store: new redisstore({             client:db,             secret:config.db.auth         })     })); 

but how can make more 1 ?