I am not common with ISS and SharePoint technologies ... I'll try to explain what I need to do.
There is a web site (call it Site A) running under ISS 6.0 and SharePoint in a Window Server 2003 with NTLM authentication.
There is another web site (call it Site B), on the same subnetwork, but java based. Hyperlinks pointing to Site B are published on site A.
For some security resaons, when a user clicks on an hyperlink to acces to Site B, Site B must know if the user is already logged in on Site A.
Is there a service with SharePoint that can be called from Site B to check if the user is connected or not using some coockies or some key propagated in the HTTP request when the user click on the link?