The System Variables functionality allows you to use codes that transform into specific content in the text displayed on the projection screen.
For example, the code @hour_minute_second becomes the current system hour, minute and second while the text is displayed.

It is also possible to write javascript methods to use as a system variable within the text that will be displayed in the projection, for example:
You can create a javascript method called saudacao and place the code @js{saudacao} in the text of a slide, or in the communication panel, or in an alert message.
The code @js{saudacao} in the text will be converted in real time to the content returned by the method defined in javascript.
It is useful for creating slides with information that can be updated in real time, without user intervention.