Do you mean anything similar to the RoundTrip Demo or anything else?

In the RoundTrip Demo the data written in the form is sent to a servlet, that publishes it on a JMS bus (provided by JBoss App Server). The LS Data Adapter implements a JMS subscriber that receives the data and injects it into Lightstreamer Kernel, that in turns delivers it to the Clients that have subscribed to that item.

So the flow is:

browser form --> servlet --> JMS --> LS Data Adapter / LS Kernel --> browsers

This is a flesible approach, because in a clustered environment more instances of Lightstreamer Server can receive the client contribution through JMS.

For simpler scenarios, Lightstreamer offers the sendMessage() method to directly deliver any data to the Metadata Adapter (that can pass it to the Data Adapter).