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I noticed this file in the program folder and it doesn't appear it's a required file to launch TightVNC.
On the other hand, when (and for what) does TightVNC use it?
I did some DuckDuckGo'ing and the only in-depth information i could find was something that dates back from 2012:
https://github.com/sim0629/tightvnc/blob/master/screen-hooks/ScreenHooks.cpp
Anyone? ;-)
/copyitright
1"In a simple language, message hooks help at detecting screen activity, so that we can get updates almost immediately instead of polling the complete screen once per second or so." TightVNC 2.5.0 release notes. – DavidPostill – 2017-04-25T21:55:23.447
So basically it's a bandwidth saver. Sounds good to me. Though a bit strange it's not required to run the program. Thanks ;-) – copyitright – 2017-04-26T01:10:16.903