swf files?

How do I add swf files to my aspx page? A master page to be more precise.

There's no reason why you shouldn't just use the <object> and <embed> html syntax like you would in any other html-emitting language...

there's also controls like this (http://www.codeproject.com/aspnet/AspNetFlashMovieControl.asp) that may or not make it easier to do so

You do it the same way you would do it with a standard HTML file.