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Server side you would handle printing through the Print API. The 'dialog' you refer to is the print dialog the browser (on the client) would popup to be able to print content of the browser to a printer on the client machine.
The two things you are talking about are totally unrelated. If you want to show some dialog that will contain settings to be able to print stuff through the server, build one.
DISCLAIMER: or I'm not understanding your problem description of course.