Because not all the activities availabe in vs.net 2005 designer for windows flow foundation are relevant in the context of SharePoint sites, Windows Sharepoint Server supports a subset of the availabe activites. This include the following:

        <ul>
        <li>
        Code.
        </li>
        <li>
        ConditionedActivityGroup
        </li>
        <li>
        Scope
        </li>
        <li>
        Sequence
        </li>
        <li>
        Replicator
        </li>
        </ul>

        <p>
        WSS provide specific activites that help in three main area: creating, updating, completing, and deleting Sharepoint tasks, creating , updating and deleting sharepoint task alerts, and enablling workflow forms within specific scopes to allow users to modify workflows that are in progress.
        </p>