How can I generate an ID like MGUID in java?  In visual C++, it's easy 
since there is a function for that, but I can't find anything like it in 
Java.  I'm creating a networking software and I need to generate a unique 
ID for each client so if anyone has a code or even just an idea
(pseudocode) please reply to me.
Can I use JNI to call the Visual C++ function? If yes, will it run in 
Linux?
  Thank you.