Being an 'old' DOS type.......

con (in Windows/DOS) means console; and yes, it's a reserved word.

Waaaay back in DOS days, if you wanted to create a config.sys or autoexec.bat from scratch you typed

copy con: config.sys
files=20
buffers=20
etc, etc, etc and pressed the F6 key to end the file.

DOS copied your keystrokes from the console and created the file.

AND......it still works in XP from the DOS prompt !!! (yes there is still a DOS prompt in XP)