How to use RDebug
From Forum Nokia Wiki
DebugView we could see the output debug message.
This trick is especially useful for tasks with special requirements. Enjoy this while debugging!!! 
After the "View process output" option has been enabled, debug the project. To display the debug messages, click Open Console button and select Debug Messages menu. The picture below shows the output of RDebug in the Carbide.c++ IDE.
plugin

How to debug with emulator on the fly).
For this, you can use several tools that show Windows debug strings, such as DebugView from Microsoft. DebugView also lets you do "fancy" things such as highlighting or excluding strings with a particular pattern.
One thing to keep in mind is that debug output may occasionally come from other processes in your system, not just the Symbian emulator, so with a tool like DebugView you may capture other strings not related to the application you are debugging. Again, filtering can be very helpful here.
tail freeware program. It is just a port of the unix tail program that prints the "tail" of a file. Just create a bat file like so:
tail -f %temp%\epocwind.out
It opens a dos-prompt to show the log prints as they come. It can be closed by pressing ctrl-C.