Hi, I'm fighting with my personal ignorance and intellectual limitations without seeing any end. Supposed you have a window that displays a string that is the concatenation of a list (of unknown length) of MVars, written by forked threads with unknown frequencies. You could check if any single variable has been updated after a given amount of time, but it is quite probable that some of them have been updated in that period of time. So you just end up reading them periodically, and displaying what can be displayed. This stupid reading happens in a recursive loop. Now, how can you handle X Events in such a situation and specifically an Exposure event? You could stop the loop and wait for the event to occur, but you need to update the display since some MVar have change in the meantime. You could wait for the event for some time and then update anyway. It's a less stupid way of reading, but I cannot find any function to achieve this result. You could just forget about it, keep on updating periodically, but then someone is going to say that your status bar has refresh issues (who cares? Once I started it I'm not going to cover it, so no Exposure event handling is needed here. If you have a problem with that send a patch, it could even be applied...;-). Actually I think I'm not able to find a working solution in a limited amount of time, no matter how huge that amount is. But since I keep reading that in order to code Haskell you must be very smart, I thought I could ask here, before giving up...;-) Ciao Andrea