$FrontEndSession (Built-in Mathematica Symbol)

$FrontEndSession is a global symbol that represents the current session of the front end from which the kernel is being run.

$HistoryLength (Built-in Mathematica Symbol)

$HistoryLength specifies the number of previous lines of input and output to keep in a Mathematica session.

$Language (Built-in Mathematica Symbol)

$Language is a list of strings which give the names of languages to use for messages.

$Messages (Built-in Mathematica Symbol)

$Messages gives the list of files and pipes to which message output is sent.

$NumberMarks (Built-in Mathematica Symbol)

$NumberMarks gives the default value for the option NumberMarks, which specifies whether ` marks should be included in the input form representations of approximate numbers.

$SystemID (Built-in Mathematica Symbol)

$SystemID is a short string that identifies the type of computer system on which Mathematica is being run.

$TimeUnit (Built-in Mathematica Symbol)

$TimeUnit gives the minimum time interval in seconds recorded on your computer system.

$CUDALinkPath (CUDALink Symbol)

$CUDALinkPath is the path to the CUDALink application.

AbortQ (Mathematica LibraryLink C Function)

mint AbortQ () returns TRUE if Mathematica is in the process of an abort.

MTensor_disownAll (Mathematica LibraryLink C Function)

void MTensor_disownAll (MTensor t) disowns all references to an MTensor that was passed between a library function and Mathematica using shared memory management.