[coliveira]

It is true that traditional languages lump local variables and return information in the same stack. But the difference is only in the way this is handled by the program. In traditional languages the programmer has no idea how parameters are passed in the stack and the compiler does everything. In Forth this is made explicit, but on the other hand there are no formal parameters to worry about (notice that Forth can use local variables if you want, it is just not the idiomatic way).