Event Logging

I want to use the functinality of
event logging in my
project but I don’t have any idea how to do event logging in QNX.Where does the log files specific to application , system gets stored???

By event logging I guess you mean kernel trace events? You can specify where the log file gets stored by using the -f option for tracelogger, or in the Momentics IDE you can define it in the System Profiler Launch Config.