Hi Canan,
do you use the clear text in your database to store the user password?
If so, here are my suggestions.
1. User Registration and Management
You can still use the existing ASP script to do the user Registration and Management.
2. Login and Authentication
Remove the register code from the Cute Chat but leave the Login and Authentication code.
After user input the username/password, CuteChat only need to check the database:
If it matches, the user can get into the chat room.
If not, CuteChat redirect the user to the error page.
Hope it helps.
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