Most of the menus and the icons on the Toolbar have been discussed in the topic About User Interface in the section Application Designer.
The Action menu is discussed below:
Menu?????  | 
Action  | 
|
#  | 
Menu Items  | 
Description  | 
1  | 
Create User Hierarchy  | 
  | 
2  | 
Selection ????? Between Nodes ????? Node Group - Child Node  | 
  | 
3  | 
Query  | 
  | 
4  | 
Views -User Hierarchy Lov  | 
  |