Links to a documentation page for each demo are provided on the following URL: http://www.freertos.org/a00090.html Each RTOS port has a demo application to demonstrate it's use. + The Demo/Common directory contains the demo application files as described on the http://www.FreeRTOS.org WEB site. Each file creates one or more tasks. The files in the Demo/Common directory are used by every demo application for every port. + All the other directories contain a project or makefile for the demo application targeted at a particular microcontroller. For example, if you are interested in the ATMega323 demo application for the WinAVR tools then the AVR_ATMega323_WinAVR directory contains the relevant makefile. The makefile includes files from the Demo/ATMega323 and the Demo/Common directories. If this is the only port you are interested in then all the other directories can be ignored.