wglShareLists() not working :(

I wanna share my display lists among different threads but the function


is not working. It simply fails returning FALSE.
Have any one used this fuction pls send me the full code or the code dealing sharing contexts.
I hope some one must b there to help me out. Pls write to me the full details so that i can figure out whats the problem with my implementation.(am using win2000 not using GLUT).
If any one know some tutorial pls let me know i shall admire it.