Hi Arnaud Bailly, Share the world? *g* is a bit vague.. Fast CGI differs from CGI in one point: your application keeps running. Thus as long as the application is running you can use IORefs (bad for multithreading) MVars (thread safe) STM etc to keep track of your "world" state and of course you can share data on filesystem and in databases.. (you must lookup thread safety in the db lib documentations) I'd like to point you to a) HAppS-State lib providing state with ACID guarantees (-> hackage or happs.org or #happs on freenode) which already does a great job as long as your global data fits within RAM. b) You definitely should also have a look at WASH. This lib already has solved many common problems. It's mainly based on CGI. http://www.informatik.uni-freiburg.de/~thiemann/WASH/ But reading the examples should give an idea about how powerful web developement can be. I'm working on some topics as well. We also have a very low traffic web-dev mailinglist (haskell.org -> mailinglist ..) Have fun Marc Weber