Connect to MyChat server with the same account from different devices; desktops, phones, OS. All history is synchronized automatically. 


This technology is called multilogin (appeared in MyChat v. 8.2). The number of devices is unlimited.


By default, this option is on, but you can disable it. Then all connection attempts from any device will be ignored, and a client application displays the error #0003: "you are already connected to the server".