In most cases, you can't. In some cases, if they used Dreamweaver and used some of it's built in scripts and functions, it'll leave behind script code with "MM" in the function names. Frontpage and ExpressionWeb often leave behind tell-tale clues in meta tags.
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Web Goddess & Web Standards Evangelist :) - Tables Be Gone !!
Although FrontPage built sites are usually pretty easy to spot
Occasionally you might find a "generator" meta element in the pages
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Chris. ->> Please login or register to view this content. Registration is FREE <<-
A foolish consistency is the hobgoblin of little minds
Thought for today:- Is SEO the only industry where all the cowboys are Indians?
Beyond that, if others are like me, they use different programs for different things. I have an excel file full of snippets I use. I may use DW to write a table. I may also just hand code something new.
I agree , it doesnt much matter what is used to author a website. Most of the ones I use are a combination of pre-made slightly altered snippets (css, header, footer) and handwritten code.