This document provides information about FFSJ, a file splitting and joining program. FFSJ consists of File Splitter and File Joiner programs that allow users to split large files into smaller chunks for storage and transmission, and then join the split files back together. The document outlines FFSJ's main features, how to download and use FFSJ, command line interface details, and provides examples of commands for splitting, joining, and generating MD5 checksums of files.