The unlock statement unlocks one or more window fields that were previously locked with the lock statement. Unlocking a field allows the user to enter data in that field.
unlock {field} field_name {, field_name, field_name...}
• field – An optional keyword that identifies field_name as a field.
• field_name – The name of a field to be unlocked.
Fields with the Editable property set to false in the Properties window can’t be unlocked using the unlock statement.