EP 6.0 SP13: Logon Screen Development: UME accessing

hi all
I am new to Portal Development.
I have been asked to do the follwoing Development:
Bespoke copy of the standard logon screen with the addition of a new field called Client.
The <b>Client field will be a pull down</b> and will get its values by calling the ABAP function module Z_EP_GET_CLIENT_LIST which runs in the backend ABAP system acting as the UME database for the Portal. This function model will return a list of clients as a table with a field called CLIENT_LIST, which is char(3). The field should be blank at launch time to force the user to select from the pull down and suitable error message should be displayed if the user does not select a client from the pull down list.
The logon details for calling the function module should be read from the UME parameters the UME parameters are :-
ume.r3.connection.master.client          Client
ume.r3.connection.master.ashost          Server
ume.r3.connection.master.sysnr          System Number
ume.r3.connection.master.user          User
ume.r3.connection.master.password      Password
Once the user has selected the client and logged on, the system mapping table for that client should be got by calling ABAP function model Z_EP_GET_SYSTEM_MAPPING passing in as a parameter the Client entered by the user. This function model will return the following table called SYSTEM_MAPPING.
This data should be persisted for the duration of the user logon in memory to avoid subsequent reads on the UMD ABAP system.
This is my new requirement??? Could anybody Guide me in this Development.
My Understanding:
1. Logon Page is: umLogonPage.jsp
2. PAR file to be downloaded com.sap.portal.runtime.logon.par.
Many Thanks
Kam

Kirupanand venkatapathi
   Thanks for that!!!!
   Sorry i am bit nervous. SO i was unable to open the file. Now i could!!!!
   What is the name of the JSP i have modified inorder to put CLIENT Filed below the password field ????
Becoz i am finding many JSPs with same name !!!!
Link below shows the ways but it is different from the one u gave:
http://help.sap.com/saphelp_nw04s/helpdata/en/f4/014e41bbd1f423e10000000a155106/frameset.htm
Could you please help me???
Thanks
Kam
Message was edited by: Kam

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Procedure
http://Ensure All cluster elements are shut down.
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