PREPARE/EXECUTE across backends?

Hi,

From the document, it seems that PREPARE/EXECUTE works only in the same 
session. I am wondering whether postgres can prepare a query (save the plan) 
for difference backends.

I am working on a project which requires executing "psql -c 'query'" in 
command line multiple times. Since the performance is critical, it would be 
nice to prepare the same query first to avoid being parsed/optimized each 
time. But psql opens a new backend each time, it looks like that 
PREPARE/EXECUTE doesn't work. Is there any workaround?

Thanks

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