Inserting special variables
You can insert special variables only into headers and footers for PDF output (Options -> Project settings -> PDF export -> Setup).
To add a special variable to a header or footer, click the arrow button 
next to the Variable button, select the Special variable menu and choose the corresponding option there:
next to the Variable button, select the Special variable menu and choose the corresponding option there:
The following special variables are pre-configured:
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page title;
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page topic;
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page status;
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help ID;
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alias;
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keywords;
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page number;
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total pages.
When you insert a special variable, Dr.Explain automatically obtains the values for the variable from the project settings and topic properties and inserts them in the specified location (into header and/or footer) when generating a PDF file.