If you installed UltraVNC, which is free and open-source software, to provide Virtual Network Computing (VNC) connectivity from/to a system for remote administration capabilities, but haven't enabled the UltraVNC server service to allow the system itself to be managed remotely, you can enable that service by taking the following steps:

1. Run the uvnc_settings.exe program, which you can find in the directory where you installed UltraVNC. You will need to provide the login credentials for an account with administrator-level access on the system.
2. Click on the Service tab then click on the Install Service button, which will install the software as a service, i.e. as a function provided by a server, on the system.
3. Once the service is installed, you can click on the Start Service button to run the service.
4. You can set the password to be used for VNC connections by clicking on the Security tab. You can set two passwords. The "VNC Password" will allow remote control of the system whereas the "View-Only Password" will only allow viewing the display on the system, which is helpful if you want to show someone what is happening on the system without giving the person the ability to control the system. You can then click on the OK button to close the UltraVNC settings window.

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