[Samba] GPL question regarding distribution

[Henrik Zagerholm]

Hi list,
I've read the GPL and have som questions regarding incorporating GPL  
tools in other software.
Lets say that I make an Webbapplication that on some occasions uses a  
GPL tool i.e nmblookup or rpcclient how much of my code do I need to  
release under the GPL? Only the code interacting with the tool or all  
of it (graphics, cgi scripts, designs etc etc)?
If that is the case how do you handle i.e designs that you have  
bought as a one use licens?

Cheers,
Henrik