$MachineName (Built-in Mathematica Symbol)

$MachineName is a string that gives the assigned name of the computer on which Mathematica is being run, if such a name is defined.

$NewMessage (Built-in Mathematica Symbol)

$NewMessage is a global variable which, if set, is applied to the symbol name and tag of messages that are requested but have not yet been defined.

$ProcessID (Built-in Mathematica Symbol)

$ProcessID gives the ID assigned to the Mathematica kernel process by the operating system under which it is run.

$SessionID (Built-in Mathematica Symbol)

$SessionID is a number set up to be unique to a particular Mathematica session.

Controlling the Precision of Results (Mathematica Tutorial)

In doing numerical operations like NDSolve and NMinimize, Mathematica by default uses machine numbers. But by setting the option WorkingPrecision->n you can tell it to use ...

Graphics Primitives for Text (Mathematica Tutorial)

With the Text graphics primitive, you can insert text at any position in two- or three-dimensional Mathematica graphics. Unless you explicitly specify a style or font using ...

Importing and Exporting Files (Mathematica Tutorial)

Importing and exporting lists and tables of data. This exports a list of data to the file out1. Here are the contents of the file.

Manipulating Notebooks (Mathematica Overview)

Cells as Mathematica Expressions Notebooks as Mathematica Expressions Manipulating Notebooks from the Kernel

Multiplying Vectors and Matrices (Mathematica Tutorial)

Different kinds of vector and matrix multiplication. This multiplies each element of the vector by the scalar k. The "dot" operator gives the scalar product of two vectors.

Random Number Generation (Mathematica Overview)

Introduction Random Generation Functions Seeding and Localization