It implements defining words ie. Additional compiler words. It does this by doing something now, and later (you could read create does> as now later>) So for

It implements defining words ie. Additional compiler words. It does this by doing something now, and later (you could read create does> as now later>) So for : CONSTANT CREATE , >DOES @ ; This makes the defining word CONSTANT, which when run (now) compiles the next word So CONSTANT myvar will compile myvar. Myvar, when run (later) will get it's value and push it to the datastack.