The Simulation tool provides a set of predefined variables which are available to every Simulation Control Program without being explicitly declared. Some of these variables are numeric and contain data such as the step number and the current value of the execution clock. Others are Boolean and represent conditions which relate to the execution status.
The predefined variables are only alterable by the Simulation tool. You cannot directly manipulated their values. They are displayed by the Monitor SCP command together with variables explicitly declared in the running Simulation Control Programs.