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Using XenCenter to logon to a virtual machine
Run XenCenter and connect to your XenServer(s).
Expand the nodes of the servers in XenCenter until you locate the virtual machine that you would like to connect to.
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Click on the name of the virtual machine that you wish to use. Now choose the Console tab to see the display of the virtual machine. Rather than press CTRL+ALT+DELETE on your keyboard, click the button that says "Send CTRL+ALT+DELETE (CTRL+ALT+INSERT)" underneath the console display.
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You should now have a logon screen. Use the Scale checkbox to enable / disable scaling of the window console. It is probably best to maximise the XenCenter window to give the console window more space.
When logging into a Server 2008 / Vista or newer virtual machine, remember to prefix the administrators username with the domain name and a backslash - otherwise you will log on with the local administrator account.
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