The type of access to requirements information each team member needs
Team members who create requirements documents must use RequisitePro, the Windows client. Team members who don't need to create documents can use RequisiteWeb, RequisitePro's Web interface. Members of the "extended team" (key stakeholders outside of the immediate project team) can also be provided access to the RequisitePro project using RequisiteWeb as a more familiar Web-based interface.
Understanding who can do what will define the RequisitePro security scheme. Project security can be set to prevent specific access to some users.