I searched a lot and didn’t find a solution.
Does any of you know of a way that I can use a hotkey to send a previously specified message to a previously specified client?
Personally, don’t really know a way for a hotkey, but this might help you.
In the client go to tools --> options --> chat --> log private chats (check that).
In the way when you open a private chat with a user you will see the history. Then just copy - paste your previous message.