I've been thinking about building this for Tcl. Tcl has been available in the browser in various forms for decades, but one thing that makes Tcl uniquely suite

I've been thinking about building this for Tcl. Tcl has been available in the browser in various forms for decades, but one thing that makes Tcl uniquely suited to a web application style development is its threading model. In Tcl, you access a thread by sending messages to it, in which a Tcl interpreter inside its event loop processes. My plan was to have a client-side Tcl program in the browser that automatically instantiates a second thread, but the thread is a remote thread running on the server, so you would be able to access the server just as if it were another thread. Something like (client-side): thread::send $::tcl-web::server -async { do stuff } placeToStoreResult ... vwait placeToStoreResult do stuff with result $placeToStoreResult