What are builds and hamachi?

[Akito]

(06-14-2016 06:57 AM)Accel Wrote:  Automated PPSSPP Builds are special version of PPSSPP that fix issues that caused by official PPSSPP version and add feature (like currently, texture replacement)

As for Hamachi, its a program that allow you to tunnel to someone's IP without portfowarding/dmz/similar stuff in order to play online. You dont need Hamachi for Lan

Would you say that there have been compatibility issues fixed using builds? i.e. Lag during multiplayer, or overall multiplayer functionality for a title that was not working.