>>>3. The spec calls for a button on the form that says 'Select all'. I then need to loop thru all the records that are being displayed to change the underlying field to .t., no? So I'm not changing JUST the active record. So again - How do I know which records to go to?
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>>2. If this is a logical field, make sure that the value of your checkbox is set to .f. (and not 1)
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>>3. If you want to Select all records that have some values, then
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>>replace LogicalField with .T. for SomeOtherField <> space(10) in GridCursor && Make sure the record is not completely empty

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>I only want to cange the records that are currently being displayed on the grid, so it's a subset of the records in the cursor/table. How do I know what records are being displayed?

What is the RecordSource for the grid?