Defining Logical Names
  To define a logical name:
  1.  Choose Logical Names...  from the Session menu.  Session
      Manager displays the Logical Names dialog box.
  2.  Type the logical name in the Name field.
  3.  Type the definition you want to assign to the logical name
      in the Definition field.
  4.  To define the logical name as concealed, click on the
      Conceal Translation toggle button until it is darkened.
  5.  Click on Define.