How to use Pwork vectors for multiple C++ Objects

I would like to use the Pwork vectors in one of our sfunctions. I have gone through the examples mentioned under this link

http://in.mathworks.com/help/simulink/sfg/making-c-objects-persistent.html

How can I pass two counter objects from mdlstart to mdloutputs.?

For eg., I have to pass the objects like new counter1 and new counter 2

In your examples in the above link it is shown like for only one object. I need to pass two object.

Kindly let me know how to do it.