You can specify a query by indicating the domain in which a symbol
  resides.  The symbol domain indicates the scope of a symbol's
  declaration.

  Click on this button to activate this selection.  Choose a domain
  attribute from the Selection box by clicking on the name of a domain
  (for example, Global).  Leave the Query Options button set to Any.
  SCA displays the selected item in the Selected box, indicating that
  it will find all occurrences of the symbol in that domain.