A/V Chat, normal chat...

What is the actual module name for the video chat?

I see: Simple messenger in the modules part
"A/V Chat" and "Messenger" in the flash apps part.

Can someone clear up exactly which part is which please?

I like the chat popup box but I don't want to offer video chat just yet because of my server being shared, i'll enable it when I get a VPS or full Dedicated server.

So I just disable A/V Chat in the flash apps?

Simple messenger = the PM system? if so then what's the "Messenger" in flash apps?

Simple-messenger and Messenger is in your modules.

You can unistall your Messenger , then you will not have the pop-up with the video chat.  ( In tools - modules )

If you only disable it ( flash apps ), you will still have the option of pressing the video-chat link on the simple-messenger and get a pop-up, but it will not load the video chat messenger.

The A/V chat has nothing to do with Messenger and simple-messenger.

I hope you can use my answer :-)