[plt-scheme] DrScheme / Common Lisp interface?

Hello,

I wonder if there is any simple way to get a DrScheme program
to talk to a Common Lisp program. Ideally DrScheme would
call a function in CL and get a return value.

I'm asking this question on behalf of someone else.
Rewriting the CL program in Scheme is not an option, unfortunately.
At present it appears the only options are talking through sockets
or shared files; these are both rather ugly.

Thanks for any light you can shed on this problem.

Robert Dodier