ETHERMON is a software implementation of an Ethernet line activity monitor. It uses any VAX/VMS DEC-compatible Ethernet interface to collect the data, and reports statistics in a form similar to the VMS MONITOR utility. It also can collect Ethernet data for post-processing by a user-supplied offline program (sample programs are supplied). ETHERMON can determine symbolic identifications of remote nodes automatically, or have them defined manually; these symbolic identifications are used in ETHERMON's displays and reports. ETHERMON can also recognize equipment other than DEC's on the Ethernet. ETHERMON.COM is the build file; the documentation is stored in the files ETHERMON.PS (PostScript), ETHERMON.LN0 (DEC LN03), ETHERMON.LPT ("dumb" line printer or plain-text), and ETHERMON.MSS (Scribe manuscript source). The on-line help library ETHERMON.HLB must be in the same directory as ETHERMON.EXE when executing the program in order for the built-in HELP command to work. ETHERMON's executable can be run either by a foreign command definition or a DCL RUN command. The unsupported utilities are to be invoked by RUN command only (they do not check the command line for their parameters). These files were compiled and linked using VAX FORTRAN V5.3 and VAX/VMS V5.2-1. There have been reported problems using the executables "as-is" under versions of VMS more recent than V5.4, and of course the executables will not run on an earlier version of VMS. Feel free to rebuild the code. If you have any questions or comments, the author's address is in the user's manual.