SSO for GNOME desktop

[Kala B <kalabalun gmail com>]

Hi,
If there is an SSO provider application on the gnome desktop, what are
the applications that typically would make use of this feature?

It would be very helpful to get the community's opinion on this. 

Does gnome plan to have something like that? Is there already
something in that direction?

Thanks & Regards
Kala B.