They're called that because (a) it's a cute name (b) they have "supernatural powers" compared to a regular user program and (c) old time hackers like cute names. Those processes are called daemons after the more-than-human spirits in Greek mythology. A process that is owned by PID 1 runs until it's either stopped by a shutdown command, or it terminates itself (or crashes.) Now, it's possible to write a program, for example in C, that creates a process that isn't owned by a shell its parent becomes the process with process ID 1, which is called init(1) on most UNIX systems, or launchd on Mac OS/X. If Java is not installed, you receive the following message: To open Java Preferences,' you need a Java runtime. Go to Applications > Utilities > Java Preferences. Since that java process was launched by the shell, it's a child program of the shell, and the shell gets back a notice that it completed. Method 3 (Mac OS 10.7 and 10.8) Use the following method to initiate the Java runtime installation or confirm if it is installed. It runs and simulates that special abstract java machine, and runs until all the normal threads of the java program terminate. It just happens to be one that includes the interpreter for java instructions, the "java virtual machine". That starts an executable program at the path /usr/bin/java, which is just a regular program. So consider running a java program from the command line: the jar file is myapp.jar and you type $ java -jar myapp.jar This update enables per-website control of the Java plug-in within Safari 5.1.9 or later. A daemon is any program that runs without being attached to a particular terminal, like, oh, launchd. Java for Mac OS X 10.6 Update 17 delivers improved security, reliability, and compatibility by updating Java SE 6 to 1.6.065. A JVM - Java Virtual Machine - is the executable that runs your java program.
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