Dynamic logon page username text based on url aliases - 7.4 portal

hi,

We are using aliases for 2 different companies.

But we need to change the logon page username text as username_comp1 and username_comp2. I understand if we change it in jar file we can change text but I would like to know how the label is linked to text in jar file.

Example:

<sap:label type="username" styleClass="urLblStdNew" flagReqClass="urLblReq"/> is the tag for username but in jar file I could see a text User.

Points will be rewared.

Thanks for help in advance!

Regards,

Sajith