Converting a piece of PIC code to Arduino

Thanks,

I understand know but to be sure I got a question :

//010001
       val_GPIO = 0x11;
       break;

This code means that GP1 and GP5 will be "high" ?

But what about this ?

GPIO = 0; //init & hold reset low

It says that it hold reset low but =0 seems to be all pins.

Thanks

Regards