As described in the previous topic, "What is a State?", all statements within a state remain active as long as the state is active. Whenever an included variable's value changes, all statements that use this variable will be re-evaluated.
This condition is referred to as being in "steady state". The statements within the state are referred to as "steady state statements". This is an important distinction when referring to VTS's extensive function library. Many functions can only be used in steady state, while others cannot ever be used in this mode.
Note that all functions that can be used in Steady State can also be used in a tag expression, although many are not useful there.