How to update member data

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Using Kino's import application, I have 125 entries with ID, email and password. Is there a way to update other attributes that have been added to the member's record e.g. FirstName, LastName, Address1, Address2, City, etc.?

In regular php/mysql programming, it would be snap to do an update query.

Is there documentation about what is "under the hood" so some custom programming could be done?

Thank you...

Todd

rtcary