> What software do you use to create the state diagram? The gray matter inside mys kull. As for tooling: nothing wrong with a mug and a pen (to draw the circles). Seriously: you don't seem to have any idea what a state is, so do some reading. Any basic programming book should contain some hint as to what state/event diagrams are for. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu