A screen cast is a digital recording of a computer screen output, also known as a video screen capture, often containing narration.
A screenshot is a picture of a computer screen at a chosen time.
Screen casts can help demonstrate and teach the use of software features to your students. You can also use screen casts to create recorded examples of a teacher solving a problem or explaining a concept in a subject like math which can be archived on a class blog or wiki for students to watch.
Sceencast or screen sharing tools:
- Windows Snipping Tool
- Smart Recorder
- Jing
1) Windows Snipping Tool:
Snipping Tool captures a screen shot of anything on your desktop, like a picture or a section of webpage. Then you can save or e-mail the image using buttons right in the Snipping Tool window.
Basic Use:
http://screencast.com/t/2oyNLeHj
2) Smart Recorder:
Using SMART Recorder, you can record the actions you take on the interactive screen. If you connect a microphone to your computer, you can record your narration. After you create a recording, you can play the recording on any computer using Windows Media Player, or you can share the recording with others.

Resources:
http://onlinehelp.smarttech.com/english/windows/help/notebook/10_0_0/RCSmartRecorder.htm
Jing Screencast(Webinar) of using Smartrecorder to create a math cast:
http://screencast.com/t/Nxg26lmH0L
3) Jing
The free online screen casting software I use is called Jing. This software is easy to install and use on our laptops.

Go to **http://tropin.edublogs.org/jing/** and go through Jing page and look at features on page.
Download: http://www.jingproject.com/
The Quick and Simple Version
- Download, install, and run Jing.
- Click the capture button, and select something on your screen to share.
- Choose to grab an image or record a video.
- Edit your image or preview your video.
- Hit Share to upload your file to Screencast.com. The URL is copied to your Clipboard.
- Paste the URL into your conversations or anywhere else you want to share
Links:
- Install and Run:http://blog.jingproject.com/2007/07/getting_started_with_jing.html
- Play Video on Blog:http://blog.jingproject.com/2007/07/how_do_i_use_this_thing_called.html