2000 / Windows XP / Windows Server 2003, direct access is not
permitted to hardware devices to try and make the operating
environment more robust and secure. When an application
tries to read or write directly to a hardware device, it
privileged instruction exception which causes Windows to
Software that used to run fine under Windows 9x fails when
run under the newer Windows OSes.
works by changing the I/O permission map for an application
and allows it to read and write a hardware device connected
to a parallel port just as it would have under Windows 98. Changing
the I/O permission map, allows the application free access to the I/O port
range of the parallel port hardware. It also supports additional parallel ports added using expansion cards.
The developer edition allows
access to any I/O port not just the parallel port