The DA Handler on System 7+ creates its own "About (DA name)" menu
which draws its own dialog and the only customization we get is to
define a "dast" string which it will draw in the dialog. To avoid
confusion having two about screens, on System 7+ just defer to this
On System 6, continue adding our own "Wi-Fi" menu as expected from a
DA, and then draw our custom about dialog.
Technically there is a way to do this on System 7 by clearing the
menu bar and adding our own Apple/File/Edit menus, but then there's
another problem of a DA can only get events from one menu. To work
around /that/, one must diddle the "MBarEnable" global and then reset
it each time the DA's window becomes deactivated. This becomes kind
of brittle, so don't bother with all of it just for a custom about
screen. MacTech 07.07 explains how to do this.
So for now, only cool System 6 users get to see Carl's sweet face.