The application is generally distributed as freeware, meaning the base use is free to end-users. UltraViewer, developed by DucFabulous Co,ltd, is a remote control support software and has many legitimate uses – it allows users to connect to other computers remotely and is used as an alternative to popular tools such as TeamViewer. These operate by generating pre-configured executables that can be downloaded and run on systems needing support these applications then connect back to server software running on the system providing support.To uninstall these files, you have to purchase licensed version of Reimage Reimage uninstall software. UltraVNC is notable as the base for free no-install remote help desk options including UltraVNC Single Click ('SC') and PCHelpWare. The 1.0.6.4 release added support for working as a Windows service under User Account Control (UAC). UltraVNC is developed in the C, C++, and Java programming languages.

It can use an optional mirror driver, to be installed on the remotely controlled computer, for fast and efficient notification of screen changes with very low CPU load, although this is not needed on latest versions of Windows 10.

The software is free and distributed under the terms of the GNU General Public License. The two computers must be able to communicate across a network, such as a local subnet, internal network, or the Internet. It also supports file transfers, chat functionality and various authentication methods. However, in addition to remote control, it adds various features, such as an encryption plugin to secure the client/server connection. UltraVNC bears a strong resemblance to RealVNC Free Edition. This is achieved by sending mouse movements and key-presses to the remote computer, and replicating the remote computer's display (subject to differences in resolution) locally in real time. UltraVNC allows the use of a remote computer as if the user were in front of it.

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