What is "Draft Workbench" in SAP PS

Dear All,

I came across a t-code PSHLP30 : Draft Workbench : My drafts.

I read about it on SAP help: http://help.sap.com/saphelp_ppm50/helpdata/en/9f/e6beb13adf493cbb112821a9a05311/content.htm?frameset=/en/9f/e6beb13adf493cbb112821a9a05311/frameset.htm&current_toc=/en/a9/8a853488601e33e10000009b38f83b/plain.htm&node_id=253

But it gives a picture on how we work with drafts by comparing drafts with operative projects then indicators etc.

Has anyone worked on it before? Please share some more information on it or plz send some documents to me if you have on this.

Thanks & Regards

Saurabh