Can this be one file?

client.js

var lazynode = require("lazynode")
    , mdm = require("./index")
    , rack = require("hat").rack(128, 16, 16)

module.exports = lazynode.connect({
    createStream: createStream
    , methods: ["add", "get"]
})

function createStream() {
    return mdm.createStream("/browserList/" + rack())
}

server.js

var lazynode = require("lazynode")
    , list = []

module.exports = browserList

function browserList(stream) {
    var up = lazynode({
        add: function (id, cb) {
            list.push(id)
            cb && cb(null)
        }
        , get: function (cb) {
            cb(list)
        }
    })
    up.pipe(stream).pipe(up)
}