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Begin
Begin["
context
`"] resets the current context.
Begin resets the value of $Context.
The interpretation of symbol names depends on context. Begin thus affects the parsing of input expressions.
See the Mathematica book: Section 2.6.10.
See also: BeginPackage, End, $ContextPath.
Further Examples
This is the current context when you start Mathematica.
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This is the current context path. A symbol whose context name is not specified is looked up first in the current context, then in the contexts in $ContextPath.
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This command changes the current context, but not the context path.
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The following symbol does not exist either in the current context Temporary`, or in the contexts in $ContextPath. As a result, it is created in the current context.
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This is its full name.
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Temporary`newsymbol
Following this command, the earlier context is restored.
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Now newsymbol is not recognized, since the context it belongs to is not in the search path.
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Information::notfound: Symbol newsymbol not found.
A very common use of Begin is to hide symbols defined in packages. This technique is illustrated in the Further Examples for BeginPackage.
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