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In most standard remote desktop configurations (like Windows Remote Desktop), only one user can access the computer at a time. However for multiple simultaneous connections, you would need to use a specialized version, such as Windows Server with Remote Desktop Services (RDS), or third-party software like Splashtop or TeamViewer, which supports multiple concurrent sessions.

To ensure your remote desktop session is private:

Use strong passwords and enable multi-factor authentication (MFA).
Ensure the remote access software uses end-to-end encryption, like AES-256.
Use a VPN to add an extra layer of security when accessing a remote machine over a public network.
Disable clipboard sharing, file transfer, and other features unless necessary.
Always log out or lock the remote machine at the end of your session to prevent unauthorized access.

No, you do not need to be physically present for establishing a remote session. You can connect to a remote computer from anywhere in the world as long as both computers have an internet connection.

Yes, Remote Desktop can work from anywhere, as long as he remote computer is powered on and connected to the internet. You have the correct IP address or network credentials to access the remote machine. Firewalls, network settings, and VPNs (if required) are properly configured to allow remote access from external networks.

No, you cannot access a computer remotely if it is completely turned off. However if the computer supports Wake-on-LAN (WOL) and the feature is enabled, you can remotely wake up the device and then establish a connection.