Making arrows, circles and other signs on attachments

Greetings,
In reading several posts I have noticed that some members here are able to bring particular attention to their problem by the use of arrows, circles, etc. on an attachment. I would like to do that also.
Would one of you direct me to the software that you use to do this?
Thank you.
Comments
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There are a number of screen capture utilities on the market.
I use Jing. http://www.jingproject.com it's free and easy to use.
Prov. 15:23
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As a non-MVP non-specialist, I agree with Kevin's recommendation of Jing [:)]
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I use SnagIT software ... it is extremely powerful but very easy to use.
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Thank you all for your advice and assistance and particularly for the link!
I just downloaded Jing and look forward to using it. It looks like its exactly want I need and its freeware [:)]
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