<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 9.00.8112.16448"> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT size=2 face=Arial>Thanks Daniel but the question I was trying to find out was:</FONT></DIV> <DIV><FONT size=2 face=Arial>Is there a way to save any  valid continuation and be guaranteed that nothing that happens in the program between the time the continuation was saved and the time the saved continuation was invoked will alter the results of invoking the continuation.</FONT></DIV> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV><FONT size=2 face=Arial>Harry</FONT></DIV> <DIV><FONT size=2 face=Arial>---------------------</FONT></DIV> <DIV><FONT size=2 face=Arial>D. Herring wrote:</FONT></DIV> <DIV><FONT size=2 face=Arial>Does an extra (let ...) do what you want, or do you want new bindings for *all* variables that are used in the continuation?</FONT></DIV></BODY></HTML>