or EXTLINUX apply to that specific program only; other changes apply
to all derivatives.
++Changes in 3.74:
++ * New UI directive, which allows a more natural way to specify
++ a menu system (or not.) With the UI directive specifying
++ the menu system, the DEFAULT directive can be used to select
++ the default entry inside the menus.
++
Changes in 3.73:
* Upgrade gPXE to release version 0.9.5.
* Fix a number of build errors on various platforms.