Preferences

There are a number of application settings that can be set with "Preferences" dialog.  Open this dialog by choosing "Preferences..." from the "File" menu.  There are three major sections:

Command Line lets you choose what the command line is for starting Ghostscript.  Generally leaving it empty is fine.  You can also choose to have the program ask you each time the program starts.

Windows and Dialogs let you set which windows are shown at start up, and how to handle the Next Page condition.  You can choose to have either a sound play or a small dialog appear, or both, when Ghostscript is waiting to display another page.

Remember lets you choose what information is remembered from one invocation of the application to the next.

Command Line

By default, Ghostscript is started with a blank command line.  This can be changed in two ways.  First, you can set the command line in the preferences.  Second, you can set the preferences to ask you each time the application starts.  In this mode, when you start the program, you will see a prompt for command line options in the console window.

Almost everything that can be set on a command line can be set after Ghostscript is running either through the Settings dialog, or by typing into the console window.  However, there are few command line options that can be useful:
 -v      prints version information and then quits
 -?      prints help information and then quits
 -dDEBUG turns on debugging during initialization
Do not set either of the first two as part of a default command line in the Preferences dialog, or each time you start it, Mac GS will display the information and quit.