Node.js cluster module

please help. I'm using nodejs cluster module: http://nodejs.org/docs/v0.6.18/api/cluster.html. I have the following code:

run.js

var cluster = require('cluster');

if (cluster.isMaster) {
    require('os').cpus().forEach(function () {
        cluster.fork();
    });
} else {
    require('./worker.js');
}

worker.js

var http = require('http'),
    connect = require('connect'),
    sio = require('socket.io'),
    // create server
    app = connect(),
    server = http.createServer(app);

server.listenPort(80);

var io = sio.listen(server);
// io.sockets.on ....

All workers listen 80 port. Each connection serves a random worker(?). Can I switch worker, where user has connected?

sorry my bad english