'Verse or Reference Question

I don't think there's a thread for this, so I made a new one. I'm really confused by a listing on TV Tropes' CSI NY page.

http://tvtropes.org/pmwiki/pmwiki.php/Main/CSINY
"Mutually Fictional: To NCIS (and Hawaii 5 O via Cross Over)"

The link for the other page, with the definition...http://tvtropes.org/pmwiki/pmwiki.php/Main/MutuallyFictional

What are they talking about? When did CSI NY ever get referenced or whatever on NCIS?

 

I'm going to move this over to Gen TV and Media, where someone might have an answer to this.

 

OK thanks.

 

I remember that--I think someone mentioned to the agents if NCIS was anything like CSI, though. New York was never mentioned specifically. NCIS: Los Angeles and Hawaii Five-O are doing a 2nd Crossover episode.

I've never seen that website before. Looks interesting.

 

Interesting, but addictive lol