Is this PC/SC or the drivers though ? The Towitoko PC/SC driver for Win32
claims to release the serial port & only claim it 'on demand'.
pc/sc requires card insertion events be delivered. So the drivers must keep
the port open. Towitoko is technically in violation of the spec, which is
one reason I like them.
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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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