Using other database in conjunction with wordpress

Hi,
I been a theme developer for long but now a requirement has come up, which is vert new to me. So i have this custom page that have login page, upon logging and clicking submit. The user is suppose to get a session id or cookie like a reference, when that is valid, the user can log in. Currently my pages are all in wordpress but what can i do to make the wordpress and authentication process seamless. By seamless i mean, some pages like search engine is based on other language, from which the server will get session id, but for website pages it should come to wordpress. It is too much to sallow but i was wondering, if i could get any help.

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