Hi all, maybe it's a dumb question, but I can't figure out the answer by looking in the archive. I have a main program which defines and initialises some variables (double, integer, string, arrays). It uses a series of units. I want the units to share the same, initialised variables. For instance, if the variable "rho" is set to 0.01 in the main program, the unit "force" must have the same 0.01 value for the variable "rho". Thanks to all, best regards Silvio a Beccara