I'm sorry, as I don't know. I mean, I don't even know what you use to write "windows" applications anymore. But are the stock frameworks that slow to justify

I'm sorry, as I don't know. I mean, I don't even know what you use to write "windows" applications anymore. But are the stock frameworks that slow to justify rewriting the toolkit? I am under the impression that writing GUI toolkits was Hard. Are there plans to make this cross platform?