[TYPO3-german] Link as login instead of username and password

[csvirtual at gmx.de]

I currently use felogin and users have to enter their username and password to see some content on my website.

Now, I would like to change that: 

Each public user should have the choice to click Link 1 or Link 2. If he decides for Link 1 he is in usergroup ABC and if Link 2 he is in usergroup XYZ (both are already created in the backend). Depending on which link he clicks and therefore which usergroup he belongs to, he sees different content. This last part is already in place.
(Username or password should not be entered anywhere because the two links should have the same function.)

Any help is greatly appreciated!
Thanks
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