 Multitasking , most commonly cooperative round @-@ robin scheduling , is normally available ( although multitasking words and support are not covered by the ANSI Forth Standard ) . The word <unk> is used to save the current task 's execution context , to locate the next task , and restore its execution context . Each task has its own stacks , private copies of some control variables and a scratch area . Swapping tasks is simple and efficient ; as a result , Forth <unk> are available even on very simple <unk> , such as the Intel <unk> , <unk> AVR , and TI <unk> . 
