Note: The print function is defined by the page environment variableA read-only variable associated with a particular page When you make the association, you name the variable, and assign it a value. When the page is opened during runtime, creates the variable. Its value can then be read. When the page is closed, the environment variable memory is freed (discarded). "PrintPage" if it exists, otherwise by the parameter [Navigation] PrintPage. To specify a function prefix the function name with "?". If no function has been defined, a screen print will be performed.