mychat://private/XXX

open a private conversation with a user with UIN=XXX;

mychat://voicecall/XXX

make a voice call to a user with UIN=XXX;

mychat://videocall/XXX

make a video call to a user with UIN=XXX;

mychat://screenshare/XXX

share screen of a computer to a user with UIN=XXX.

mychat://quit

stop MyChat Client application