When you build examples and then go to their respective pathes (examples/*), you will see a bunch of shell scripts, basically launch.sh and stop.sh. This is because at the exception of hello, the examples need multiples processes to run. shell scripts are there to control all the processes launching or stopping at once, in different X terminals.
So in order to launch an example, cd go to its path and launch launch.sh
cd workers-single-factorial
./launch.sh
You should end up with a screen like this:
Workers Factorial example output when launched