Xylotex Pin9) No. You need a seperate 5V DC power supply to power the Xylotex boards. You connect pin 9 of the connector to +5V from the power supply to power the board. The ground from the 5V supply goes to pin 1 of the connector.
Xylotex Pins 7, 8) Although you can use any output pins from the parallel port for step and direction, For a 3 axis system most use parallel pins 2-7 for step and direction. Typically, use pins 2 and 3 for the X axis, 4 and 5 for the Y, and 6 and 7 for the Z axis. Use 2,4, and 6 for either step or direction, and 3,5, and 7 for the other.
Xylotex pin 6, Enable) This either enables or disables the drives. It appears that there is a jumper on the board that overrides this pin. You could use this for an E-stop, but a proper E-stop should also kill power to the drives power supply as well, for safety reasons. I believe that most Xylotex users just use the jumper to leave the drives always enabled. You can also let the control software enable/disable the drives buy connecting this to a parallel port pin.
Xylotex Pin5) This is not for homing the motor, and is no longer available on newer Xylotex boards. Disregard.
Xylotex Pins 3 and 4) Set with the jumpers and ignore these pins.
Xylotex Pin2, sleep) similar to enable, but I believe that when disabled via enable, the motors will still hold position. When disabled using the sleep pin, there will be no power to the motors. Another option that I think has been removed from newer boards, because no one used this feature.
Pin1, ground. See Pin9 at the top.
In another post you asked about back EMF. If you keep you power supply voltage below about 28volts, you shouldn't have to worry about it. Back EMF is when the steppers act like a generator during deceleration and send power back to the drive.
ONe more thing. I see you've posted basically the same question a couple times. Duplicate posts are against forum rules, so, in the future, try to pick the most appropriate forum and ask the wuestion there. Thanks, and I hope this helps a little.