A KeyID build is a special build used mainly for translation-related QA work on localized builds. It helps to identify UI (User Interface) and OLH (Online Help) strings based on their KeyID. A KeyID is a unique 6-digits number that serves as identifier of the string in the Sun's translation database.
There is no functional difference between a regular build and a KeyID build. The difference between the two is that the KeyID build displays the KeyIDs of the strings in the UI and OLH. KeyID builds are regular provided for all Sun provided languages each release. See the announcements in the dev@l10n mailing list.
See the illustrating screenshots taken on a French regular and KeyID build:
Where to find en-US sdf files ?
For every milestone en-US sdf files are created. You can download them from one of the mirrors in: http://distribution.openoffice.org/mirrors/#extmirrors
Making your own KeyID build
There is a script which can be used to add KeyIDs of a new kind to an existing sdf file. Template:Documentation/Note Template:Documentation/Note The script is located in the Sources in module transex3 in the Path scripts\keyidGen.pl Call it without parameters for usage help.