RadRichTextBox has an implementation of printing only using the PrintDialog. We have logged a feature request to implement printing to the default printer without any user interaction, but we have not scheduled it yet. That is why we have not researched how "direct" printing can be implemented yet.
When it comes to silent printing to the default printing, you can vote for this feature and track our progress using this PITS issue
. You can also download the source code of the controls in order to see how the pagination has been achieved in our implementation of printing. As for printing to a specific printer, you can search through MSDN and the related forums. This thread
for example discusses this topic.
I hope this helps.
the Telerik team
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