Deprecated - Database compatibility

dear my new friends
can someone help me regarding SSO application? i'm thinking to come out with a portal that require a user to login only once and he/she can access all the systems inside that portal
currently all the systems are parking separately and user need to login 4 each of the system
how to cater with this problem: to centralize all these systems..since all of them developed by different vendors and have different structure.
is it possible to lump all the existing database in a single database( e.g: oracle 10g)? how to do this?

i created a new page that select the title of nodes under a category with id cid=7 from my database but i v some encoding plm
you can see it at this link

http://www.elnasllnas.com/site/article2.php

the code of the page is :

Untitled Document

Hi,

is there any way to encrypt the data stored on database in Drupal5

Can someone tell me what this means. I would gladly appreciate it. I uploaded 5.2 to a shared hosting server and it comes with a .htaccess script. Do I need to change something in that. Also the server is Linux. Powweb.com is the provider.

Failure to connect to your MySQL database server. MySQL reports the following message: Access denied for user 'creator'@'cgi0903.int.bizland.net' (using password: YES).

My shared hosting company switched our database access from MySQL 4 to 5. Do I need to upgrade or do anything to the database folder that comes with the drupal installation. Right now it has scripts database 4.0 MySQL, database 4.1 MySQL, database pgsql, and the update.inc script. Do I need a 5.0 MySQL script.