MicroThread is a minimal Borland/Turbo C multi-threading library for DOS programs. It consists of a pre-emptive scheduling kernel which dispatch threads on DOS INT 8, and has support for semaphores, critical sections and inter-thread messages.
basE91 is an advanced method for encoding binary data as ASCII characters. It is similar to UUencode or base64, but is more efficient. The overhead produced by basE91 depends on the input data. It amounts at most to 23% and can range down to 14%.