I would like to know if a user agent is used when checking link ?
If yes, is it unique or randomized?
When going from page to page, is the link similar to a visit?
My question comes down to whether the link is "activated" by something that looks like a normal visit for Google.
Since a lot of sites use the tracking script, Google probably comes to know if which way the visitors comes ... or bots. They could be wise to modify the IP headers and even to let load the famous tracking script for Ser manual verification ....