$DatabaseLinkDirectory gives the directory where DatabaseLink is installed.
SetPeriodicalInterval[id, interval] resets the time interval for the periodical task with the given id.
$OpenCLLinkLibraryPath gives the path to the OpenCLLink library files.
$OpenCLLinkPath gives the path to the OpenCLLink application.
$TetGenInstallationDirectory gives the top-level directory in which your TetGen installation resides.
PopupMenu[x, {val_1, val_2, ...}] represents a popup menu with setting x and possible values val_i. PopupMenu[Dynamic[x], {val_1, ...}] takes the setting to be the ...
$CCompilerDefaultDirectory returns the default location for creating output.
ClosedKernel["linkname"] represents a Lightweight Grid kernel that was successfully closed.
RemoteKernelCloseAll[] closes all kernels returned by RemoteServicesLinks.
CAddress[obj] is a symbolic representation of the address of an object.