Can you create a field that requires the user to input the same data twice? This field could be used for error checking on numerous applications.
This field could be used to enter a password twice (to make sure you typed it the same and did not have an error in entry) or could be used to ensure accuracy with the data input for critical fields without having to use two different fields to enter the same data.
Example: Input critical location number of item number - type in the mandatory field once. After you enter it once, it blanks out and you have to enter it a second time. If the inputs do not match, it will not accept the entry.