[Beowulf] mutex (remote memory access) question for MPI-2

[Plinius Frobenius]

Hi,
I've red through the chapter in "Using MPI-2" about mutexes.
Suppose that you know in advance that only one cumputer (say node y) can 
access the memory-window on node x (except node x itself).
How should your mutex-code look like (you still need a mutex, since both x 
and y can access the memory)? (since you won't need the entire 
"tree-mutex-code" provided by Rajeev Thakur, I guess, since there are only 
two processes able to acces the memory...). I haven't enough experience yet 
to find this one by myself, and really need it for the program I'm working 
on.

Thanks for any ideas/hints/help...
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