Suppose I have a page consisting of 3 frame's (classic): the header, sidebar and content.
The users of search engines often give a link to the page with frameset'om, and page individual frame'and content.
As a result, the user cannot see the header and menu, because they are on other pages. How to force browser to always open the main page with the frameset, even if the user opened in the browser of an individual frame.