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Technical Overview
  internal package Foswiki::UI::Viewfile  
UI delegate for viewfile function
 StaticMethod viewfile( $session, $web, $topic, $query ) 
viewfile command handler.
This method is designed to be
invoked via the 
UI::run method.
Command handler for viewfile. View a file in the browser.
Some parameters are passed in CGI query:
	
		
			 filename  | 
			 Attachment to view  | 
		
		
			 rev  | 
			 Revision to view  |