I'm reading about division in MIPS and I've found that div
Divides $s by $t and stores the quotient in $LO and the remainder in $HI
http://www.mrc.uidaho.edu/mrc/people/jff/digital/MIPSir.html
And Wikipedia says
HI and LO are used to access the multiplier/divider results, accessed by the mfhi (move from high) and mflo commands.
http://en.wikipedia.org/wiki/MIPS_architecture
Are HI and LO registers? What number registers are they?