You can implement single sign-on for use with Novell Vibe, so that users do not need to log in separately to GroupWise and Vibe. See the following sections in Planning an Advanced Vibe Installation in the Novell Vibe 3.2 Installation Guide:
Planning an Advanced Vibe Installation
Configuring Single Sign-On with Novell Access Manager
Configuring Single Sign-On with Internet Information Services for Windows