It's often trivial to cross-compile a basic command like program, OS filesystem specifics might be a small issue but there it's generally Windows vs everything

It's often trivial to cross-compile a basic command like program, OS filesystem specifics might be a small issue but there it's generally Windows vs everything else. Building one (mostly shared) codebase for different platforms is fine; or even shipping a script that's run locally. However the solution to this problem needs: * To already be installed on every updated OS * Work, mostly, the same across every OS * Include the widgets we know from the last 20-30 years. It's mostly that first bullet-point that's the killer. Windows needs it. OSX needs it. Neither the end user nor the application developer should have to worry about it staying updated. I'd be happy enough if, across all the major OS today, I could use a pipe or localhost socket to talk to the browser and use it to render a webpage within a basic OS window (ZERO other browser decoration or interactions, still OS decorated). If THAT alone worked on every operating system that would be enough of a basic step for 99% of the CRUD style apps out there. Small extra bonus if a message-passing interface worked between the two.