Filechecker & SFC?


I just passed my A+ OS this morning and want to know if anyone can tell me the meaning and details of <SFC> or is there such a program called <Filechecker>?
Also, after passing the A+ HW exam and cramming my brain with the OS portion I was disappointed not to get a single question asking about networking (Physical/Hardware).
Lastly, id like to say Thank you for all the questions and experiences I've read in these forums because they all made a very large difference with how I approached the OS portion.
Rong.
I'm sure this will help all techs around the world.
Comments
Congrats!! On a side note, I went crazy memorizing IRQ and I/O addresses and saw not a single q on my exam. Conversely I was surprised to be asked about the use of function keys at the cmd prompt on the OS exam.