It’s actually quite simple. I always thought it was difficult and you’d have to learn from a code sheet, but I found an app which teaches you and you actually just recognise the sounds like you’d recognise any other sound. You generally don’t even need to decode it- you just get used to what a letter sounds like. I’ve been learning since Saturday and can already key my name out.
As much as you’d do in multiplayer - that you have a chatbox.
I’m thinking of installing computercraft eventually and having them talk to each other using the telegraph system