A Variable Equation can be used in a Function Expression or User Subroutine.

The VARVAL function is used to get the variable value in a Function Expression. For more information, see System Element Functions for Function Expressions.

The SYSFNC function is used to get the variable value in a User Subroutine. For more information, see Intrinsic Functions in a User Subroutine for User Subroutines.