Stef, Esteban, I would be very open to FFI but them immediately start to wonder about OS threads. From what I remember of the OpenSSL non-blocking calls, somebody else can do that part - I'll use threads. Dolphin has what are called overlapped calls that are made on a separate thread. Originally, it pulled from a pool of threads. The latest version might ensure that all calls from a given Smalltalk process are made on the same OS thread. My requests for such a feature in Squeak/Pharo have always been met with "yeah, you could do that if you wanted" or something along those lines. Ideally, I would hope the FFI gurus would embrace it and do it properly. Have they done so? Bill