Q: Why would this be required?
  Q: How is it done?

I left my reader plugged in overnight and it still doesn't work.  I would
guess the charger uses some particular rs232 signal for power, and the
program asserts that signal.
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Linux Smart Card Developers - M.U.S.C.L.E.
(Movement for the Use of Smart Cards in a Linux Environment)
http://www.linuxnet.com/smartcard/index.html
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