VA Hashtags is a feature of Visual Assist that is a combination of named bookmarks and task manager.
Use the VA Hashtags tool window to see all hashtags in the current solution. If the VA Hashtags tool window is not visible after installation of Visual Assist, open it with its default shortcut (Shift+Alt+H) or via the VAssistX menu.
Learn to use VA Hashtags in the Navigation section of this wiki.