How to display a web page within another website ?

How to display a web page within another website ? Example The longdesc attribute points to a page with a long description of the content of an iframe: Definition and Usage The longdesc attribute specifies an URL to a page that contains a long description of the content of an iframe. Note: The longdesc attribute is so poorly supported that it should not be used. Tip: To offer a long description of an iframe (if necessary), simply create a link (that is visible to anyone) to a page with the description. An URL to a page that describes the content of an iframe. Possible values: An absolute URL - points to another web site (like longdesc="http://www.example.com/description.txt") A relative URL - points to a file within a web site (like longdesc="description.txt")