][+ Shift Key Mod?

[LOSETHECAPITALWORDSedhel@bigfoot.com (Edhel Iaur, Esq.)]

Does the ][+ shift key mod only make the shift keys act (in addition
to their old tasks) as the joystick button associated with PDL(2)?

Does it take specially-made programs to recognise the shift key mod?

Is the single wire running from the keyboard plug (or those other
places where the shift key's signal can be grabbed from) to the game
port the only part of the shift key mod, or is it more complicated
than that?
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