This site:
http://docs.hp.com/en/J2656-90030/apas02.html
indicates that the “dup” key is the same as a control sequence (ctrl + D). You might be able to map the “dup” to a function key.
Here is a freeware program to assign “hot-keys”
http://www.autohotkey.com/
From WaltZ400:
If you are doing 5250 emulation through Client Access the shift-Insert keystroke is mapped to do a dup function.
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