configTOTAL_HEAP_SIZE

What parts of FreeRTOS use Heap memory?Does freertos kernel use it? How we can set its value for our application? configTOTAL_HEAP_SIZE I am using AVR.

configTOTAL_HEAP_SIZE

See http://www.freertos.org/a00111.html and http://www.freertos.org/FAQMem.html