Some top politicos are now urging the Gov to reach out to fuel cell mfrs. Ford was mentioned, with a potential billion dollar investment. I mentioned this group's talent pool for developing a controller (forgive me). Some serious work is being done on embedded Linux systems. Real mode kernels are being used. Most development is focused on small appliances. A large process controller would not be so constrained. My feeling is; 1) Use protected mode, multitasking Linux PC to "manage" 2) multiple real mode Linux x86 add-on cards. Quite a variety of x86 embedded cards exist. Some are complete 486 computers on a chip with full I/O, memory, etc., and plug into ISA slots. Perhaps DOS could be used for the embedded card? Lot's of questions!