Installation and Setup of the MacOS Version The self-extracting file PHREEQC.sea will expand upon opening to reveal a folder containing the application program, three database text files, 12 example text files, the PHREEQC manual in pdf format (requires Adobe Acrobat Reader obtainable from ), a Source code folder containing the current source code, and this ReadMe file. PHREEQC on the MacOS operates as a console program much like the DOS or Unix versions. Upon opening PHREEQC (FAT), a command-line dialog box will appear. This dialog allows you to enter the command-line arguments as they would be invoked from a command-line operating system. The arguments are the input file, output file and database file; they must be entered in order, but succeeding arguments can be skipped if the default files are acceptable. Clicking "OK" will lead to the main console window ("Quit" allows you to abort the process), and can be used to bypass the command-line if you prefer to enter filenames interactively. (The buttons toward the bottom of the command-line dialog allow you to redirect the console input and output to files, if desired). The main console window will be the only other place that you interact with PHREEQC directly. The top line informs you what PHREEQC is doing. You should wait for the message "application has terminated" before quitting the application. The console output depends on the input file; for faster runs set PRINT -status false since writing text to the console window may be time consuming. When the console window is displayed, the File menu and Edit menu allow copying or printing of the displayed text. Since the input and output files are text files, you can use SimpleText to create or edit them. However, SimpleText will not handle text files larger than 32k; a better free editor is BBEdit Lite (available from or ) which can easily handle large text files. If you are exchanging files between DOS and MacOS, be aware that the end-of-line sequences are different (CR-LF on DOS, but just CR on MacOS). 16 June 1998