If you use a sendkey with {ENTER} (Or w/e you put for the return key) & {H}, will it act as if you are typing in an "H"? If it does, then it is possible that:
1.)(I have not used this type of programming so bear with me) The Function keys don't work with that type of script (Unlikely but had to throw thta out there)
2.)Conquer Online receives special packets when a Function key is pressed.
I'll look to see if there are any interesting packets sent when a Function key is pressed. But you may be right on this, although I do believe that Toreddo made a guide for Health Potter that used a sendkey {F3} function and it must have worked:\
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--------------------------------------------------------------AFTER-------------------------------------------------------------------------
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I didn't see anything special, you might want to make sure that you Capitalized the "F" correctly, if need be, or if you typed something wrong. I checked packets sent if i typed in "A" or if i pressed a hotkey of any kind, and it is the same responses, but the nagain im not a packet expert:\ Toreddo's guide may be of some insight to you if you still have problems,


I hope those are of help to you.