'Helvetica Neue'和Helvetica字体

我看过一些使用字体系列的网站：

I have seen a few of the the websites using font family:

font-family: 'Helvetica Neue',Helvetica,Arial,Sans-Serif

我记得在stackoverflow上阅读一些较老的问题，Helvetica字体不是免费的，它只在Mac上可用，是吗？我使用的是Windows XP，我可以看到正在渲染的字体是' Helvetica Neue '，我不记得自己安装任何字体。所以我想问的是，如果它是安全使用上面的字体家庭？ （例如，大多数Windows电脑是否会呈现这些字型？）

I remember reading in some older question here on stackoverflow that the Helvetica font is not free, and it is available on Mac only, is it so? I'm using windows XP and I can see that Font being rendered is 'Helvetica Neue', and I don't remember installing any font by myself. so all I wanted to ask is if it is safe to use the above font family? (eg. will most of the windows computers render those fonts? )

谢谢。