Hi list: In the application i'm now developping, I need a mean to time a response interval to an item. I could use the classical : start-time: now/time delta-time: now/time - start-time but this produce a interval in seconds... I should need an interval in tenth of second ! Does REBOL/Core 2.3.0.3.1 support any function like CPU ( ) in some other language ? Does anybody have any solution to this problem ? Thanks in advance !!! ;-) Christophe Coussement