Richard,

It all depends on the connection pool of the browser. Each browser process instance allows a maximum number of concurrent connections to the same host. In some cases this number is 2, in other cases it's larger.

If you launch independent browser instancesm the connection pool is not shared. But this applies to IE and not to Firefox (which creates one process instance only).

If you don't want to share your Lightstreamer connection (and Metadata Adapter) among multiple Data Adapters, a trick could be to use alias hostnames. In some cases, the browser just looks at the hostname and not at the IP address to allocate a connection pool.