"Secret passages" to content that should be safely behind the paywall? What are they on about? You can't magically link to a full article that's behind a login / subscription unless their site security code is very broken.
If there we doing this right then for non-logged in users they would show a brief intro to the article and a link to the login / subscribe forms.
As funny as it may be, it's actually possible with X and XEmbed. Even though X haters have been screaming for years that network transparency needs to go.
Tetris in Stereogram 3D
Yep, it works. My eyes are bleeding all over the keyboard now. Thanks 8I
Those who can, do; those who can't, write. Those who can't write work for the Bell Labs Record.