Merapi is the way to go:
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Thanks for your answer, Greg.
Merapi looks very promising, though it's still beta.
I guess AIR has no native support for doing the same things,
without an external library.
Is there any alternatve for to Merapi for the .net world ?
AIR 2.0 might have support for accessing native applications, but for now you need to find some other technology as a go-between.
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Looks like I've to do it on my own. Let's hope, that AIR 2.0 contains such