Managed Systems are strongly recommended, but the reality is that it costs money. So, the alternative is TeamViewer.
TeamViewer is my choice for Remote Access to systems that are not monitored or managed regularly.
My preference would be to have TeamViewer Host installed so that we do not have to go through the steps establishing our remote connection every time you need support.
Note: Installing Team Viewer Host allows me unattended access to the computer whenever it is on.
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