Button function returning user operating system and browser version?

按钮功能返回用户操作系统和浏览器版本吗？

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MS-DOS is a single-tasking, single-user operating system with a command-line interface.

MS-DOS是带有命令行界面的单任务处理、单用户操作系统。

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The bottom line is that UNIX was and is a reliable, secure, multi-user operating system that continues to dominate the enterprise Web - and application-hosting landscape.

UNIX一直都是可靠、安全的多用户操作系统，这使它持续在企业Web和应用程序托管领域占支配地位。

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Android is so far proving relatively popular with tablet manufacturers despite nagging concerns about fragmentation of Android's operating system, user-interface and app store ecosystem.

ENGADGET: Strategy Analytics: Apple still owns tablet market, but Android narrows the gap

So we've seen the same thing from the same two big players for a long time, and like when I got here there's a billboard that somebody's reinvented mobile with exactly the same operating system and user experience that everybody else has.

ENGADGET: The Engadget Interview: Jolla CEO Marc Dillon at MWC 2013

Okay, okay, we're making good use of sarcastic italics, but we do have a point: we take such things for granted to the point where it might not have occurred to naysayers that just being able to minimize a window could make an operating system more user-friendly.

ENGADGET: Chrome OS review (version 19)