Membership login required/If not member->Get Redirected

I wasn't sure how this will work. I am in the works of making a site that you must first log into before you can view any other pages. I was curious when it came to search engines crawling my site? Will the only see one page because they will keep getting redirected to the login page if they don't login? Or will they see them all? Anyone know how to optimize this?

 

the only way to optimize that is by cloaking.

that, or allow snippets of the page to be viewed without registering and you just need to register to see the whole thing.

 

There is no way to detect crawlers and allow them to browse the site? Or would this be dangerous?

 

you can do that, it's called cloaking, and it is dangerous.