It's possible to make an online level editor that runs on a web page, however, if you use common web techniques (AJAX) the resulting load is too high for most webservers. JAVA or something might be a solution, but who wants to use THAT? (as a client, not as a coder) I think most luck would come from hooking up jcs.exe with something that changes its memory or shares it with other players, as someone has already done. I think the project was abandoned, unfortunately.