Generating Private, Unique, Secure URLs

Question

I\'d like to generate a secure one-click-access type of url similar to the examples below. I\'ll be using PHP but that is irrelevant as I\'m just looking to understand the under

Answer 1

I would avoid this for:

1) Instant log in shortcut/icon for users

because these URLs can be cached/logged on proxies, weblogs, browser cache, bookmarks, emails etc.