Description: 02/14/2002 Stackless was a controversial modification to Python, separating its execution stack from the C execution stack, the C-stack. With Stackless you could set up multiple execution chains, switch between them, change them, or restart them. Uncoupled from the C-stack, you could capture the control flow of your Python program and manipulate it any way you wanted to. Manipulating the execution stack is the basic idea behind continuations, a building block for many other obscure.
