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This entry was copied from DeeZire's Red Alert 2 and Yuris Revenge INI Editing Guide for the sake of completeness. As it is not our intention to rip off DeeZire's work, this article is subject to a re-write and update with the latest community knowledge.
For further information, please read Inclusion of The Guide.
Lists the specific houses which have exclusive rights to build this object. The object cannot be built even if other houses capture the appropriate Prerequisite= and acquire the relevant TechLevel= required to construct it.
This is not quite valid for ForbiddenHouses, however. <none> will do the trick there and unset the base rules' list, but an empty list will not do anything.
Editor's note: "unsetting" this tag by overriding it using RequiredHouses=<none> or just leaving the RequiredHouses= list empty under the unit's section in a map (or in an INI loaded with Ares' #include) will not work. In such a case all Countries must be listed under RequiredHouses= (or better in Ares' #include case, have the flag removed from base rules entirely) before every Country is eligible to build this TechnoType.