Yes, there is only one LogoffURI value per Agent Configuration Object but :
Yes, you can only define one LogoutURI value per Agent Configuration Object but :
Other Information that may be on interest:
The Siteminder logout function essentially deletes the SMSESSION cookie value. Since in some cases the normal way to delete browser session cookies can fail (with some older IE versions). The SMSESSION cookie is set to SMSESSION=LOGGEDOFF
The common problem is usually to provide a post logout page, that either returns to a different page depending upon where the user came from, often done by a redirect back to a page based on where the user came from, or the page wants different branding depending upon where it came from.
Another trick, is the loading of the logout URL into a component on a page, such as into a hidden image rather than re-directing the whole users browser to the logout URI. This will effectively run the Siteminder logout process, but allow the designer to embed the single Siteminder logout reference on any number of web pages.