I thought the same thing. There certainly have been Scheme systems developed that can serialize closures and continuations (e.g. I found [1], and the systems th

I thought the same thing. There certainly have been Scheme systems developed that can serialize closures and continuations (e.g. I found [1], and the systems they cite in the related work section). But it seems tricky to get the garbage collection to work right... somehow you need to tell the program which data should be serialized, and which should be stored in RAM and somehow marked as still being live. For the security aspect, maybe the server could have a secret key and store a MAC along with the serialized string? [1] http://www.iro.umontreal.ca/~feeley/papers/PierardFeeleySW07.pdf http://www.iro.umontreal.ca/~feeley/papers/PierardFeeleySW07...