How to OpenSharedWorklist

I want to make a custom workspace.
I check the reference
http://kb.k2workflow.com/ArticleAttach/K2%20blackpearl%200807%20Feature%20and%20Functionality%20Changes.pdf
I find it shows that there is a method called OpenSharedWorklist, but I couldn’t use it.
Or are there other methods to get worklist included SharedWorklist?
Thanks for your help.