How to see if someone's invisible in gmail's gtalk

Follow these steps to unveil your buddy's presence...

1.When he/she's online click on their chat window, you'll see options there..click on options...then go off the record...

2.Then, when he/she's offline and u want to test whether they are invisible or not..just send an IM..anything, like hi,hello or whatever...

3.If he/she's online then they'll receive your message without any error..else..u'l get an error that the person was not able to receive your message..

4.That's all!!!

But this method has a dis-advantage that you have to ping them to know whether they are offline or invisible. one more dis-advantage is that they can easily turn the chat record on and which means they'll receive the messages even offline