Use the editable source window to edit the source code of the program
  you are currently debugging, or any other source code file.

  Location          Function
  ---------        -----------

  Buffer            Displays an empty text buffer for text entry,
                    or a full text buffer containing the text you will
                    edit.

  Search String     Accepts a string for forward or backward search.
     Entry Box

  Directional       Indicates the direction (forward, backward) of
     Arrows         a search.

  Replace String    Indicates whether search string is replaced when
     Toggle         found.

  Replace String    Accepts a string that replaces the specified
     Entry Box      search string.

  Buffer Menu       Provides a list of active buffers, any of which
                    you can choose to display.