I have need to log all commands run through both a direct system console login, and incoming telnet connections.  One of
 the systems I support is freezing about once a week, and we believe it is a process or program being run by the client.
 I've been unable to find any proof, as I'm not sure exactly what commands or processes they're running to do so.

I have looked at the logging script located at http://www.qnx.com/developers/qnx4/qnx4kb/solution.html?code=9962

However what I've been asked to find is a way to log this in such a way that it is completely run in the background and 
unseen. So I can't use the logging script, as it notifies of where the log file is, does not use the set prompt, etc. 

Because of requirements I must follow, I'm not able to recompile that program, so I can't make the modifications - 
besides, I'm not very familiar with the code that's probably needed. I support the system, but I do not develop programs
 for it.

Is there a way I could accomplish what I was asked?

Thanks in advance for any assistance.