Hi Sudeep,
The following discussion forum posts address similar questions. You may want to have a look at these if you haven’t already. Hope this helps!
Best Regards,
Chris J
LabVIEW EPP control using Windows 2000
http://forums.ni.com/ni/board/message?board.id=170&message.id=27641&requireLogin=False
Help building drivers for custom-built hardware over EPP (Enhanced Parallel Port) on NT
http://forums.ni.com/ni/board/message?board.id=170&message.id=4683&requireLogin=False
How to read 32 bit from my EPP 32bit data register?
http://forums.ni.com/ni/board/message?board.id=70&message.id=1665&requireLogin=False