send function keys to a legacy DOS program

[Justin Ezequiel]

Greetings,

We have an old barcode program (MSDOS and source code unavailable.)
I've figured out how to populate the fields (by hacking into one of
the program's resource files.)
However, we still need to hit the following function keys in sequence.
F5, F2, F7
Is there a way to pipe said keys into the program?

I know it's not really a python problem but I got nowhere else to go.
I've tried other barcode solutions but none give the same output.