[OFBiz] Users - How to use Security in Ofbiz

[Souvik Saha Bhowmik]

Hi,
   I see Ofbiz has a security feature. In the Controller.xml under the
<request-map> tag there is a <security> sub-tag. If its auth attribute
is set to true then the user is redirected to the Loogin page if he is
not logged in.
Now in my application I want to use this feature. I have my own login
page. How cani configure so that on supplying any uri the request will
be redirected to my own login page if the user is not logged in.I also
must mention here that my login page authenticates the user from my
own table and not from any of the tables already provides. I shall be
highly obliged if anyone guides me to solve this problem
Souvik