Unique Session Id

[Tahir52]

Hello,

I am trying to sync my web application (developed using oracle forms 11g) users with the session id generated by the Oracle DB. I want a unique session id for each user which logged into my application.
For example:
A user named "ABC" logged into the application at this particular point Oracle DB will create an audit trial against some unique id.

I want to know how to get that unique id which remains same through out the session (until the user logged out of the system).

Regards,
Tahir