Yes. If you have list processing on a screen, the at line-selection event just needs to be written as normal. I usually put it in an include in the TOP include. Remember to check the screen number, so that the doubleclick functionality works only on your list processing screen.
If you want doubleclick functionality on a dialog screen, you just need to define the F2 key with a function code on the menu of the screen. Double click will then give an OKCODE, corresponding to the function code assigned to F2.
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