Pins: Power Switch, Power LED, Reset Switch, HDD LED, PLED, SLED ?

[KDakshin]

I'm building a computer, and the manual shows two pin connectors of JFP1 and JFP2.
What I'm having confusion with, however, is where these pins should go.
Power Switch, Reset Switch and Power LED are self-explanatory, whereas the others..

So, to my question: What are the HDD LED, the PLED and the SLED used for?

Thank in advance!

 

[plaintuts]

It's for the lights that eminates from your chassis.

Hdd ked is for hard disk activity
The others are for indicator lights usually on the front panel.

 

[KDakshin]

Thanks guys! One more question. Can I use a normal 1.5 volt led available at most electronic shops for these led's? And what specific voltage should I use?

 

[plaintuts]

Yeah, molex supply 5v.