Hi Yogesh,

You best option is run Photon and use Help viewer program.

Also try to get couple of QNX4 books:

1. Frank Kolnick «QNX4 Realtime Operating System» ISBN 0-921960-01-8
2. Robert Krten «Getting Started with QNX4» ISBN 0-9682501-0-6

-- 
Respectfully,
Oleg

> I am working on vQNX4.25.can you suggest some programing guide based on
> QNX4.25?
> 
> Yogesh R. Sagane
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post59072