hi every body

i have registration page with customer can edit their details. i want to export registration info. as csv file.

i want to export the registration records. but after the records are exported, they need to be flaged as exported. so next time when i export,i will only export the records which haven't been exported.

Also if people edit their profile (or so-called registration information), i need to change the flag to unexported So when customer exports the records next time, these edited records will also be exported.

so pls anybody know how to do it???

thanks in advance.