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You can try teamviewer or join.me quite easily.
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when I install and log in<br />
&nbsp;what should I give to user
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If you're using join.me, all you need to give the user is the url. This will be along the lines of join.me/xxx-xxx-xxx
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Teamviewer is a little more complex, in that the user will also need to run the software and they will provide you with the password that they are presented with.
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I need to remotely log into windows 7 &nbsp;machine to trouble shoot<br />
<br />
is there any free tool
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I need to remotely log into windows 7  machine to trouble shoot

is there any free tool

remote access

Remote access may refer to the connection to a data-processing system from a remote location, for example through a virtual private network remote desktop software, terminal emulation, or the activation of features of a business telephone system from outside the business's premises.