NWBC for Desktop can be launched from the portal as long as you build the URL correctly, see this link for details. In order to have SSO in case of NWBC for Desktop, NWSSO (v2+) is the way to go. NWSSO is not an IdP. As I wrote, I don't think launching NWBC (be it Desktop or HTML) from the portal is the way to go. You should use NWBC for Desktop to access portal and solve the SSO requirements by using a SSO product such as NWSSO.
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