User1, user2, user3...when is it used?

[JMG]

Hi!

I was thinking of using the user1, user2, user3, user4 fields in the pictures table in a little mod that im working with. But first I want to check when these fields are used...so when are they used? 

/JMG

[Casper]

They are the custom settable file info fields, set in config.  The show on the file info in the displayimage.php if populated, and on the editpics, editonepic and upload forms, where the info can be edited, also if set in config.