Re: two usages of continuations

[Matt Wette]

On 05/09/2018 04:55 PM, Matt Wette wrote:

Hi All,

I'm currently reading a paper that references [1] to state that there exist two usages of continuations. 1) if invoked continuation is prefix of current continuation, it is downward

2) otherwise it is upward

Would anyone like a shot at elaborating this?
Does this mean a called continuation is downward if it is a tail call?

I found more on this.  A downward invocation is an escape.