Interaction with R

Hello eve-R-ybody,

i'd like to know where i can find some documentation about how calling 
foreign programs from a R function and use the results obtained.
I mean, make an other program compute the value of a complex formula and use 
the result as an object in the R function.
I'll be very glad if any of you give me a response.

(Excuse me if you don't understand clearly what i'm saying : english is not my 
mother tongue)

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