[Koha] Get the firstname alone

[celestialcitizen at gmail.com]

Hi,

When a user logs in to Koha system his first name and surrname are  
retrieved from the sql database and are displayed on the page
Now I want to customize it so that only the firstname is displayed.
Can anyone tell me which part of the code contains this functionality and  
how do I change it to suit my needs

Regards
Anand
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