"Introduction to Manipulate" and "Introduction to Dynamic" provide most of the information you need to use Mathematica's interactive features accessible through the functions ...
The function FindClusters finds clusters in a dataset based on a distance or dissimilarity function. This package contains functions for generating cluster hierarchies and ...
Copy
(Mathematica Front End Token) "Copy" is a front end token that copies a selection to the clipboard without deleting it from the document.
Copy copies a selection to the clipboard without deleting it from your notebook.
AtomQ
(Built-in Mathematica Symbol) AtomQ[expr] yields True if expr is an expression which cannot be divided into subexpressions, and yields False otherwise.
Hyperlink[uri] represents a hyperlink that jumps to the specified URI when clicked. Hyperlink[label, uri] represents a hyperlink to be displayed as label.
Mouseover[expr, over] represents an object that displays as over when the mouse pointer is over it, and as expr otherwise.
ParallelArray[f, n] generates in parallel a list of length n, with elements f[i], evaluated.ParallelArray[f, {n_1, n_2, ...}] generates in parallel an n_1*n_2*... array of ...
Precision[x] gives the effective number of digits of precision in the number x.
SpokenString[expr] gives a string of text corresponding to a spoken representation of the expression expr.