This is a really important question for many people who have blocks of code delivered to their webpages using SSI or shared borders. Many of us use these for navigation, advertising links, optimizations, etc...

I know that the spiders read these blocks of code, but can spiders tell that they are being delivered this way?

Also, can spiders find files on our servers that are being used exclusively as landing pages for google adwords (on google or content sites) and overture payperclick?