Postscript is a stack-based language, like Forth. Essentially, you **push** data onto a **stack**, and then operate on whatever is on top of the stack.
As such, this means you write in **postfix** notation, so that, for example
```
% comments begin with %
% add 40 to 2 to get 42
40 2 +
% move to (100,120)
100 120 moveto
```

## Defining
```
/mymoveto { moveto } def
/mylineto { lineto } def
% and then
100 100 mymoveto
200 200 mylineto
```