if a vistor types it manually into their search bar to visit it? for example you can have a page where the user needs to fill out a captcha to view the url address in text. after the user fills in the captcha, he/she can cut and paste the url address into their browser to view the content. can google know that your visitor is visting that page from your site?
yeah , i would like also to know, for instance if i am on one page, and then i write in the address bar the url of another site, is there a tracking system to find where i am coming from?
Only if you are using google toolbar or site you are going to has got analitycs on it. But in both cases this is data that google shouldn't use, despite they have access to it.