$ControlActiveSetting (Built-in Mathematica Symbol)

$ControlActiveSetting is a symbol whose value is True if it is evaluated while a control is active, or in certain other previewing situations.

DynamicModule (Built-in Mathematica Symbol)

DynamicModule[{x, y, ...}, expr] represents an object which maintains the same local instance of the symbols x, y, ... in the course of all evaluations of Dynamic objects in ...

Khinchin (Built-in Mathematica Symbol)

Khinchin is Khinchin's constant, with numerical value \[TildeEqual] 2.68545.

PassEventsUp (Built-in Mathematica Symbol)

PassEventsUp is an option to EventHandler that specifies whether events handled by a particular event handler should be passed up to event handlers in outer expressions.

ValueQ (Built-in Mathematica Symbol)

ValueQ[expr] gives True if a value has been defined for expr, and gives False otherwise.

Concurrency (Mathematica Guide)

Mathematica provides not only automatic parallelization capabilities, but also a full built-in symbolic language for specifying concurrent computation.

Hypergeometric0F1Regularized (Built-in Mathematica Symbol)

Hypergeometric0F1Regularized[a, z] is the regularized confluent hypergeometric function \[Null]_0 F_1 (a; z)/\[CapitalGamma](a).

Hypergeometric1F1Regularized (Built-in Mathematica Symbol)

Hypergeometric1F1Regularized[a, b, z] is the regularized confluent hypergeometric function \[Null]_1 F_1 (a; b; z)/\[CapitalGamma](b).

MathieuCPrime (Built-in Mathematica Symbol)

MathieuCPrime[a, q, z] gives the derivative with respect to z of the even Mathieu function with characteristic value a and parameter q.

MathieuSPrime (Built-in Mathematica Symbol)

MathieuSPrime[a, q, z] gives the derivative with respect to z of the odd Mathieu function with characteristic value a and parameter q.