MatchLocalNames is an option for Trace and related functions that specifies whether symbols such as x should match symbols with local names of the form x$nnn.
Pause
(Built-in Mathematica Symbol) Pause[n] pauses for at least n seconds.
UsingFrontEnd[expr] evaluates expr, making use of a front end if necessary.
$Aborted is a special symbol that is returned as the result from a calculation that has been aborted.
Functions in Mathematica are carefully set up so that you normally do not have to know how they work inside. But particularly for numerical functions that use iterative ...
Mathematica allows convenient discovery and customization of all aspects of its system setup.
AbortProtect[expr] evaluates expr, saving any aborts until the evaluation is complete.
AbsoluteTiming[expr] evaluates expr, returning a list of the absolute number of seconds in real time that have elapsed, together with the result obtained.
DynamicSetting[e] represents an object which displays as e, but is interpreted as the dynamically updated current value of Setting[e] if supplied as Mathematica ...
Extract
(Built-in Mathematica Symbol) Extract[expr, list] extracts the part of expr at the position specified by list. Extract[expr, {list_1, list_2, ...}] extracts a list of parts of expr. Extract[expr, list, h] ...