What are DJc1 SPc1 NDc1 futures news channel refers to?

I have seen on cnbc and on news web sites about djc1, spc1 and ndc1 futures trading before opening of US markets? what are these futures and where are these traded?

http://www.reuters.com/article/marketsNews/idCAN2127665620081021?rpc=44

where can i get quote of these futures before opening US markets?

 

http://www.bloomberg.com/markets/stocks/futures.html

 

thanks do you know where these futures are traded? Which exchange? Also, are these futures trade 24 hours?

 

Every hear of the CME or CBOT or Globex?

http://www.cmegroup.com/

The futures trade almost 24 hours from Sunday evening to Friday at 16:15 EDT.