Definition of beaker for Students. : a cup or glass with a wide mouth and usually a lip for pouring that is used especially in science laboratories for holding and measuring liquids.
In Microsoft Windows, each environment variable's default value is stored in the Windows registry or set in the AUTOEXEC.BAT file. On Unix, a setuid program is given an environment chosen by its caller, but it runs with different authority from its caller.
System environment variables define the behavior of the global operating system environment. Local environment variables define the behavior of the environment of the current instance of Cmd.exe. System environment variables are preset in the operating system and available to all Windows XP processes.