How does it work?
http server provides a well known input method
Frontends parse and moderate the input
Backends translate input to the language of dbupdate
Server frontend checks the input for validity and sends it to server backend
Server backend updates the database and feeds back to server frontend
Server frontend provides acknowledgement in textual format, and mails notification
Backends passes output directly to frontends
Frontends convert the output to http response
http server communicates the result.