After the connection is established, the remote screen is visible to the user at the other endpoint. The core of TeamViewer is remote access to computers and other endpoints as well as their control and maintenance. The functionality of TeamViewer differs depending on the device and variant or version of the software.

Support for Windows Phone and Windows Mobile has been phased out after Microsoft discontinued support for the two operating systems. TeamViewer is also available for smartphones and tablets running Android or Apple's iOS/ iPadOS operating system, very limited functionality on Linux based operating systems. Besides, there is Raspberry Pi OS, a Debian variant for the Raspberry Pi. There are also packages for several Linux distributions and derivatives, for example, Debian, Ubuntu, Red Hat, and Fedora Linux. TeamViewer is available for most desktop computers with common operating systems, including Microsoft Windows and Windows Server, as well as Apple's macOS. The development was very successful and gave rise to TeamViewer GmbH, which today operates as TeamViewer Germany GmbH and is part of TeamViewer AG. The IT service provider wanted to avoid unnecessary trips to customers and perform tasks such as installing software remotely. Rossmanith GmbH released the first version of TeamViewer software in 2005, at that time still based on the VNC project. TeamViewer is the core product of developer TeamViewer AG. It has been installed on more than two billion devices. TeamViewer is proprietary software, but does not require registration and is free of charge for non-commercial use. It was first released in 2005, and its functionality has expanded step by step. TeamViewer is a German remote access and remote control computer software, allowing maintenance of computers and other devices. Windows, macOS, Linux, Android, iOS/ iPadOS

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