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Re: Foreign functions, subprocesses in akcl.

   foreign functions:

See documentation on defentry and faslink.
The file lsp/littleXlsp.lsp provides a good example.

    forking a sub process with associated streams:

There is a file c/run-process.c which is used in some versions eg sun.
You may need to repair something in this, but it gives the basic idea.
If you do fix a bug please send it in.

Function in the SI package:
Args: (string)

Execute the command STRING in a subshell and return a two way stream 
associated to this.    Use si::fp-output-stream to get an associated
output stream or si::fp-input-stream.
Bugs:   It does not properly deallocate everything, 
so that it will fail if you call it too many times.