A reactive script interpretor is a broadcast event-driven interpretor which can react to several commands in parallel. The basic principle is that absence of an event cannot be decided before the end of the current interpretor reaction. Generating events and waiting for occurrence of events are the basic commands which are composed in several ways to build complex behaviors. Moreover, one can also define objects with associated methods run when a nonblocking order is sent to them. Method execution is immediate (in the same interpretor reaction as the order) and a method can be executed at most once during each reaction. Reactive script interpretors are implemented using the Reactive-C language. Finally, it is shown that reactive scripts are a mix of two formalisms: the \Name{SL} synchronous language, and the \Name{ROM} Reactive Object Model.