$Canceled (Built-in Mathematica Symbol)

$Canceled is a symbol returned when notebook input is canceled, for example from a dialog box.

$ConfiguredKernels (Built-in Mathematica Symbol)

$ConfiguredKernels is the default list of kernels that are configured to be launched for parallel computing.

$KernelID (Built-in Mathematica Symbol)

$KernelID is a unique ID number assigned to each running parallel kernel.

$LicenseID (Built-in Mathematica Symbol)

$LicenseID is a string that gives the license ID under which Mathematica is being run.

$Urgent (Built-in Mathematica Symbol)

$Urgent gives the list of files and pipes to which urgent output from Mathematica is sent.

Data Manipulation (Mathematica Overview)

"How to" Topics Files, Streams, and External Operations Importing and Exporting

Expressions (Mathematica Overview)

Everything Is an Expression The Meaning of Expressions Special Ways to Input Expressions

Two-Dimensional Expression Input (Mathematica Overview)

Moving through Expressions Selecting and Deleting in Expressions Typing Fractions

SWF (Mathematica Import/Export Format)

Registered MIME type: application/x-shockwave-flash Adobe/Macromedia Flash file format. Used for interactive and animated vector graphics, video and sound on the web. SWF is ...

Riffle (Built-in Mathematica Symbol)

Riffle[{e_1, e_2, ...}, x] gives {e_1, x, e_2, x, ...}. Riffle[{e_1, e_2, ...}, {x_1, x_2, ...}] gives {e_1, x_1, e_2, x_2, ...}. Riffle[list, x, n] yields a list in which ...