Way to handle multi-user access

Hi,
What is the way to handle multi-user access in .Net pages, as Session variables cannot be passed to other projects? I do need more details for identifying different user login, upon that one project is calling another project.
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HuaMin ChenProblem resolverAsked:
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StephanLead Software EngineerCommented:
It al depends is how your projects are related. Are you having the projects in the same site domain? Can you use formsauthentication based on cookies to enable crossapps?
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HuaMin ChenProblem resolverAuthor Commented:
Yes, all the projects are deployed in the same site domain. Can I have more details to store login/password using cookies? Thanks
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apeterCommented:
Are you looking for this, http://forums.asp.net/post/2693763.aspx

OR

You can use Passport Authentication

The Passport authentication provider is a centralized authentication service provided by Microsoft that offers a single logon and core profile services for member sites. Passport is a forms-based authentication service. When member sites register with Passport, the Passport service grants a site-specific key. The Passport logon server uses this key to encrypt and decrypt the query strings passed between the member site and the Passport logon server. For more information, see Passport Authentication Provider.
Pros
Supports single sign-in across multiple domains.
Compatible with all browsers.
Con
Places an external dependency for the authentication process.
Implementation
To implement Passport, you must register your site with the Passport service, accept the license agreement, and install the Passport SDK prior to use. You must configure your application's Web.config file as follows:
<!-- Web.config file -->
<system.web>
   <authentication mode="Passport" />
</system.web>
For more information, see the Microsoft Passport Web site (http://www.passport.com/).
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StephanLead Software EngineerCommented:
You can use forms authentication to enable crossapps. But you setup some configurations to make it work. Here is N article that shows you a way to do this:

http://www.codeproject.com/Articles/106439/Single-Sign-On-SSO-for-cross-domain-ASP-NET-applic

if it is not clear I can explain in detail but I need to be on a computer to do this instead of a mobile phone.
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