If you are invoking the heap analyzer from a directory other than the
  one that stores your application source code, you can set a source
  directory for the heap analyzer as soon as the startup screen appears.

  To set a source directory:

  1.  Choose the Set Source...  menu item from the Options menu on the
      heap analyzer screen.

      The Set Source dialog box appears.

  2.  Enter the directory specification for your source directory as you
      would for the OpenVMS Debugger SET SOURCE command.

      For more information on this command, see the debugger SET SOURCE
      command in online help.

  3.  Click on OK.

  The heap analyzer can now access your application.