As of the Fall 2007 release, Active Displays support SharePoint Groups. When an action is defined or executed, both “All Users” and “SharePoint Group” are respected when referencing a “Person or Group” column data type, such as Assigned To or CC.
For example, say a user creates a SharePoint group called “My Team” which only contains individuals from a particular team. An Assigned To column is set to reference the My Team group. When a user accesses an action entry form that uses the Assigned To column, they will only see the people in the “My Team” group, not “All Users.”