how to use Internal pullups?

Hi
I am going throw a tutorial from microship with this code:
INTCON2bits.RBPU = 0; // enable PORTB internal pullups
WPUBbits.WPUB0 = 1; // enable pull up on RB0

If we enabling all portb pullups in line one and pulling them up to Vdd, why do we need line 2 of code? can any one explain this or is the code wrong?

Tanks in advance

It helps if you mention which chip you are using as they are not all the same. I'm assuming it's a 18 series chip and the first line is the global enable and the second is for each individual bit. Why don't you download the data sheet so you can easily check these things.

Mike.