Can the KM be accessed by another non-sap portal?

Company has portals based on Vignette.

Also has SAP CRM, where a catalog is based in KM.

Can the Vignette portal or Vignette Content Management System connect to KM?

Can any other CMS's connect to KM?

I would ask on a Vignette forum, but I haven't found one yet.

Thanks!