Built-in Mathematica Symbol

SystemInformation

SystemInformation[]
gives detailed information about the Mathematica system being run.

SystemInformation["comp"]
gives a list of rules with information about the component "comp".

SystemInformation["comp", "prop"]
gives the value of property "prop" for component "comp".

When run in a notebook interface SystemInformation[] yields a graphical form; otherwise it gives a list of rules.

	"Kernel"	Mathematica kernel used for evaluation
	"FrontEnd"	Mathematica front end used for display
	"Devices"	devices, drivers, etc.

SystemInformation gives information on the kernel in which it is evaluated, and the front end in which it is displayed.

SystemInformation["comp", ...] returns Missing["NotActive"] if the specified component is not active in your current system.

Display system information; browse to relevant tab for details:

Get a list of information rules for currently open links:

Out[1]//Short=