IRC (rfc1459): Which event says that I am connected?

I am just about to implement some parts of rfc1459.

My thing is:

how do I know that my script is correctly connected to the network. I mean what event says your "yes sir. you pass all my inspections, go ahead"

I'm currently check if there occurs the message ":Welcome" :3

if ':Welcome' in s:
        print 'Connection established...'
        self.send('JOIN %s\r\n' % self.channel)

Solution

I actually figured it out!

My first issue is that there is an rfc that updates the rfc1459: rfc2812

lo and behold there is a welcome message RPL_WELCOME.

Thats exactly what I want to know!

- Timo