Dynamic pages ignored by SE?

How does a SE know that the page is dynamic?

[ariet]

I keep hearing that warnings against using dynamic pages, because SE might ignore them.

However, how does a SE know the difference if the reference does not include the actual page name?

I virtually always call my pages by directory (e.g. /products/) and have the server figure out that it needs to send (or parse) index.html or index.asp (or any of the default names).

[jatar_k]

The problems don't arise with dynamic content specifically. They are with long query strings.

As long as the same url request always returns the same page and there is no query string then you don't need to worry.

[korkus2000]

It knows by either the extension or querystring. You need to try and avoid long querystrings with multiple parameters. I wouldn't really worry about .asp or .php.