This marks the second time Microsoft has made a copy of Windows 7 available as a free preview.

这标志着微软第二次作出可免费预览的Windows 7。

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And many mobile devices can display Office files for reading using built-in, free apps; iOS's Preview app is the most capable of these.

同时许多移动设备能够使用嵌入式的免费程序去显示Office文件，iOS的预展程序是这些程序中的佼佼者。

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The HP Smart Web printing program is a useful free solution that organizes online research right in your browser. Its ability to modify and preview documents before printing is also a help.

惠普智能网页打印软件是一款用处很大的免费软件，能把网上看到的有用内容直接在浏览器中进行剪贴，而且它的编辑和打印预览功能也颇有用处。

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When viewers stumble upon a video requiring payment, they'll get a free preview up to 2 minutes long before being asked to subscribe.

NPR: YouTube's New Pay Channels Go From Campy To Kids

To access the free preview, customers can select "On Demand" on their U-verse remote and scroll to Screen Pack, or they can search "Screen Pack" on Uverse.com and on the U-verse app.

ENGADGET: AT&T Screen Pack gives U-verse TV subs on-demand access to 1,500 films

Another feature rolling out is "Free Preview" which lets viewers watch before they're finished logging in, while a Server Side API on the way should open up access to more apps on more devices.

ENGADGET: Adobe pushes TV Everywhere forward with Adobe Pass 2.0, promises easier logins on more devices