This is documentation for Mathematica 9, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)

Mathematica Session Information

Mathematica gives you immediate access to many details of your Mathematica session—in the form of symbolic expressions that can readily be manipulated by the Mathematica language.

ReferenceReference

Names names of known symbols

?name information about symbol values, functions, etc.

Streams ▪ Links ▪ Notebooks ▪ $Packages ▪ $ContextPath

SystemInformation display system information

NotebookInformation information on open notebooks

Options ▪ $FrontEndSession ▪ $FrontEnd ▪ CurrentValue

Directory ▪ FileNames ▪ $Path

$SessionID ▪ $ProcessID ▪ $UserName

Time Information »

TimeUsed ▪ SessionTime ▪ DateString ▪ AbsoluteTime ▪ ...

Memory Information »

MemoryInUse ▪ MaxMemoryUsed ▪ ...