One can find information on installing Telnet Client from: Microsoft Windows, PuTTY, Fettes PS, The Windows Club, Wikipedia, Petri, Tech Recipes, Tech Net, Locker Gnome.
It has either a single client requesting a service
gmud32.exe is a graphical client that enhances games played through Telnet. More information can be found at http://gutterstar.net/gmud.php
Most Unix-like operating systems, including Linux and macOS, come with a basic telnet client package pre-installed. Windows also includes a telnet client, but it may need to be enabled through the "Turn Windows features on or off" settings. Additionally, various network utilities and tools often include telnet clients as part of their offerings.
Neither. According to the FAQ on its website, it has no graphic environment; rather, the user types text commands and sees descriptions of the environment as text. This requires the user to have a Telnet client - such clients are already included in Windows, among others, but the website recommends installing some other Telnet client, one that includes support for color, and for backspace (to correct typing errors).
client/server application
TELNET commands are primarily used to control the TELNET client and manage remote connections. Basic commands include open to connect to a remote host, close to disconnect, status to display connection information, and help to access a list of available commands. Users can also use control characters like Ctrl+] to access the TELNET command prompt for further commands. Additionally, commands such as set and unset allow users to configure various options for their TELNET session.
Internet browser.
The most likely reason is that there is no telnet daemon running on the computer. Other reasons may be that you are connecting on the wrong port, or your client is on the hosts.deny list.
To use a Telnet app on an Android smartphone, first, download a Telnet client from the Google Play Store, such as "Termux" or "JuiceSSH." Open the app and enter the Telnet command along with the desired hostname or IP address and port number (e.g., telnet example.com 23). Once connected, you can interact with the remote server using the command line interface. Make sure your phone is connected to the internet for the connection to work.
If you want better security, use secure shell (ssh) instead of telnet. Actually, don't use telnet at all if possible, as it transmits all information in plain text.
Windows XP is primarily considered a client operating system, though Windows XP Proessional does provide some types of servers, such as IIS and Telnet.
It is a good idea to change the information associated with Telnet. You should change your password, username and any accounts associated with the company.