I have a found set of 1900 records (from a dataset of over 4000 records) which all need to be updated in the same way--they all need to have the same value in a field defined with a radio button value list. This value-list field is now blank (i.e., no radio button is selected) for all of these found records. How can I automate the process of updating all 1900 records at once?

You really should just post once per topic and just check for replies to your post before posting the same question again. Double posting is just not a good idea.