This box displays the following usage attributes that you can select
  to specify declarations, references, and other occurrence classes.
  To select an attribute, click on the desired attribute and it appears
  in the Selected box.  The usage attributes are:

         Address-reference to the location of a symbol
         Associated-associated declaration (such as
         EXTERNAL)
         Call-call to a routine or macro
         Command Line-command-line reference
         Declaration-both Primary and Associated declara-
         tions
         Fetch-fetch of a symbol value
         Include-source file include reference
         Other-any other kind of reference (such as a macro
         expansion or use of a constant)
         Pointer-reference to the location of a symbol
         Precompiled-precompiled file include reference
         Primary-most significant declaration, such as the
         declaration that defines the symbol
         Read-fetch of a symbol value
         Reference-all references
         Store-assignment of a symbol
         Write-assignment of a symbol
         Use-Ada USE reference
         With-Ada WITH reference
         Separate-reference to an Ada Unit defined as
         SEPARATE
         Base-reference to base class of a C++ class
         Friend-reference to a friend of a C++ class
         Member-reference to a member of a C++ class
         Limited-reference to an Ada limited private type
         Private-reference to a private C++ object or Ada
         private type
         Protected-reference to a C++ protected object
         Public-reference to a C++ public object
         Virtual-reference to a C++ virtual object