This variable determines how thin client handles nested ActiveX events. Because thin client processes Windows messages while waiting for responses from the server, it is possible for new ActiveX events to be sent while still waiting for an earlier event procedure to return, causing event procedures to be nested within event procedures. Because nested event procedures can cause unpredictable results, including memory access violations (MAVs), this variable is set to 0 (off, false, no) by default. If you want to enable it, set it to 1 (on, true, yes).