[plt-scheme] file lock

Hi,
Is it possible to have PLT-scheme lock a file such as to prevent simultaneous access from different stand allone programs? I looked around in the docs, but could not find any related topic. I am sure it is possible somehow, for MSWord can.
Greetings, Jos Koot

I use version full-369.1-bin-i386-win32.exe on Winsows XP home.
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