what is the if condition for first visit?
 

I want to know the if condition for the first visit
I know it is available in notices but i want to use it in templates
and any one know does the first visit is read by search engines?

is there any answers?

There doesn't appear to be such a conditional... the "first visit message" on FORUMHOME seems to simply be controlled by $show['guest'].

Other code may be at play but it doesn't look like you can get it from a template conditional.

As for if it's read by search engines, find a forum in google, and click on the link in google to the cached copy of the page- that will be the same thing google sees.