https://technet.microsoft.com/en-us/sysinternals/bb897434.aspx
zoomIt: 演示必备辅助软件 ZoomIt（主页|介绍）是一款非常实用的投影演示辅助软件。它源自Sysinternals公司，后来此公司被微软收购，因此，有些网友也称ZoomIt为微软放大镜。ZoomIt体积小巧（只有一个exe文件，0.2MB）、完全免费、易于使用。通过快捷键可以很方便地调用ZoomIt三项功能：屏幕放大、屏幕标注、定时提醒
ZoomIt v4.5
By Mark Russinovich
Published: June 20, 2013
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Introduction
ZoomIt is a screen zoom and annotation tool for technical presentations that include application demonstrations. ZoomIt runs unobtrusively in the tray and activates with customizable hotkeys to zoom in on an area of the screen, move around while zoomed, and draw on the zoomed image. I wrote ZoomIt to fit my specific needs and use it in all my presentations.
ZoomIt works on all versions of Windows and you can use pen input for ZoomIt drawing on tablet PCs.
Using ZoomIt
The first time you run ZoomIt it presents a configuration dialog that describes ZoomIt's behavior, let's you specify alternate hotkeys for zooming and for entering drawing mode without zooming, and customize the drawing pen color and size. I use the draw-without-zoom option to annotate the screen at its native resolution, for example. ZoomIt also includes a break timer feature that remains active even when you tab away from the timer window and allows you to return to the timer window by clicking on the ZoomIt tray icon.
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