Special Web Authentication

A general authentication system:

1- User Id and Password request

2- Access to resources

Extended authentication system:

1- User Id and Password request

2- Access to extended authentication

2- Extended authentication

3- Access to resources

I have to develop the Java components for the extended authentication but the main requisite is to have the lower impact on preexisting website... how can I accomplish this?

Help me, please!

[490 byte] By [Alortesfbfhfgytytua] at [2007-10-1 14:52:42]