Multithreading with WWW-Lib?

Hi,

I am using the WWW-Lib-5.3.2 with a Preemptive profile in a Multithreaded
manner.
Where I start several Thread each calling th WWLib Api to make HTTP requests
in Solaris.
I am seeing some Core dump with memory access violations 

First can anyone tell me if  WWW-Lib-5.3.2 is thread safe?
Second do I have to use Start a separate Preemptive profile for each Thread
to initialize the WWW-Lib?

Thanks
Any help would be much appreciated.
Duc