Grid[Partition[Names["$*"],4]]
->
$Aborted                       $ActivationGroupID             $ActivationKey                 $ActivationUserRegistered
$AddOnsDirectory               $AllowDataUpdates              $AllowDocumentationUpdates     $AllowInternet
$AssertFunction                $Assumptions                   $BaseDirectory                 $BatchInput
$BatchOutput                   $BoxForms                      $ByteOrdering                  $Canceled
$CharacterEncoding             $CharacterEncodings            $CommandLine                   $CompilationTarget
$ConditionHold                 $ConfiguredKernels             $Context                       $ContextPath
$ControlActiveSetting          $CreationDate                  $CurrentLink                   $DateStringFormat
$DefaultFont                   $DefaultFrontEnd               $DefaultImagingDevice          $DefaultPath
$Display                       $DisplayFunction               $DistributedContexts           $DynamicEvaluation
$Echo                          $Epilog                        $ExportFormats                 $Failed
$FinancialDataSource           $FormatType                    $FrontEnd                      $FrontEndSession
$GeoLocation                   $HistoryLength                 $HomeDirectory                 $IgnoreEOF
$ImagingDevices                $ImportFormats                 $InitialDirectory              $Input
$InputFileName                 $Inspector                     $InstallationDate              $InstallationDirectory
$InstalledServices             $InterfaceEnvironment          $InternetProxyRules            $IterationLimit
$KernelCount                   $KernelID                      $Language                      $LaunchDirectory
$LibraryPath                   $LicenseExpirationDate         $LicenseID                     $LicenseProcesses
$LicenseServer                 $LicenseSubprocesses           $LicenseType                   $Line
$Linked                        $LinkSupported                 $LoadedFiles                   $MachineAddresses
$MachineDomain                 $MachineDomains                $MachineEpsilon                $MachineID
$MachineName                   $MachinePrecision              $MachineType                   $MaxExtraPrecision
$MaxLicenseProcesses           $MaxLicenseSubprocesses        $MaxMachineNumber              $MaxNumber
$MaxPiecewiseCases             $MaxPrecision                  $MaxRootDegree                 $MessageGroups
$MessageList                   $MessagePrePrint               $Messages                      $MinMachineNumber
$MinNumber                     $MinorReleaseNumber            $MinPrecision                  $ModuleNumber
$NetworkLicense                $NewMessage                    $NewSymbol                     $Notebooks
$NumberMarks                   $Off                           $OperatingSystem               $Output
$OutputForms                   $OutputSizeLimit               $Packages                      $PacletSite
$ParentLink                    $ParentProcessID               $PasswordFile                  $PatchLevelID
$Path                          $PathnameSeparator             $PerformanceGoal               $PipeSupported
$Post                          $Pre                           $PreferencesDirectory          $PrePrint
$PreRead                       $PrintForms                    $PrintLiteral                  $PrintServiceRequest
$PrintServiceResponse          $PrintShortErrorMessages       $PrintWSDLDebug                $ProcessID
$ProcessorCount                $ProcessorType                 $ProductInformation            $ProgramName
$RandomState                   $RecursionLimit                $ReleaseNumber                 $RootDirectory
$ScheduledTask                 $ScriptCommandLine             $SessionID                     $SetParentLink
$SharedFunctions               $SharedVariables               $SoundDisplay                  $SoundDisplayFunction
$SuppressInputFormHeads        $SynchronousEvaluation         $SyntaxHandler                 $System
$SystemCharacterEncoding       $SystemID                      $SystemWordLength              $TemporaryDirectory
$TemporaryPrefix               $TextStyle                     $TimedOut                      $TimeUnit
$TimeZone                      $TopDirectory                  $TraceOff                      $TraceOn
$TracePattern                  $TracePostAction               $TracePreAction                $Urgent
$UserAddOnsDirectory           $UserBaseDirectory             $UserBasePacletsDirectory      $UserDocumentsDirectory