Describing Multi-foundation with Tools Release 9.2.3 64-bit
This configuration is recommended for a business partner who provides a custom solution and for customers who maintain their own customization's. You will need a development environment at 32-bit and testing environments in both 32-bit and 64-bit.
The first server will remain for production, and should be at 64-bit. The second server should be for DV and PY path codes, the foundation will be Tools Release 9.2.3/32-bit. The third server will also be for DV and PY, but the foundation will be Tools Release 9.2.3/64-bit.

Having both Tools Release 9.2.3/32-bit and Tools Release 9.2.3/64-bit foundations on the Deployment Server enables you to build development client packages in either bitness. In this configuration, you have production in 64-bit mode, so Enterprise Server 1 is using Tools Release 9.2.3/64-bit foundation. Enterprise Server 2 is at Tools Release 9.2.3/32-bit foundation and enables you to build 32-bit server packages. It also supports the development and testing of your solutions or customization's in 32-bit mode. Enterprise Server 3 is at Tools Release 9.2.3/32-bit foundation and enables 64-bit server package builds. It also supports the testing of your 32-bit solutions in 64-bit format because your 32-bit solution will be converted to 64-bit during OMW check-in. The 64-bit version of your solution will be used to build the 64-bit server package.