Hi Dhinesh,
You use EHSM via the SAP Portal. There are several threads on the subject that you can easily find in the forum.
I myself have asked many questions since I have to implement it for my client (I haven't started the implementation phase yet).
Check this link (document created bu Christoph Bergemann) :
http://scn.sap.com/docs/DOC-41109
You can have a look here :
http://help.sap.com/saphelp_ehsext30/helpdata/en/5b/22b8d6606b4d32b8af9283901d3bdc/frameset.htm
Regards,
Philippe