Designed for users of SAS in the UNIX environment, this companion is a valuable reference tool. This documentation describes the features of the SAS language and SAS interface that are available only on UNIX or that behave differently on UNIX than on other platforms. You will learn basic X window concepts, how they relate to SAS, and how to use X resources to customize your SAS session. Additional topics include: working in and customizing the SAS windowing environment, using SAS files, using external files and devices as sources of input and as receivers of output, printing and routing SAS output, and accessing shared executable libraries from SAS. A reference section describes the SAS language features, such as data set options, procedures, and system options, that have aspects specific to UNIX. This title is intended for SAS software users who have had some experience with SAS and with the UNIX operating environment. System administrators will want to read this title to understand how SAS works under UNIX.