can I use a numeric keypad ( via USB ) on the left side of my keybaord ??

Hi all,

I want to add a numeric keypad to my computer that I can use on the left
side..
I have a normal keybaord wit a numeric keypad build in to it ( like everyone
else

Will there be trouble between the one in my keyboard an the one i will
install through USB ??
Can I use them both at the same time ??

I'm looking at a trust NUMERIC KEYPAD & USB HUB
http://www.trust.nl/products/product.htm?artnr=12837

Is it possible ??