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StackBegin
StackBegin[
expr
] evaluates expr, starting a fresh evaluation stack.
You can use StackBegin to prevent "outer" evaluations from appearing in the evaluation stack when you call Stack.
StackBegin has attribute HoldFirst.
A StackBegin is automatically done when the evaluation of each input line begins in an interactive Mathematica session.
See the Mathematica book: Section 2.5.11.
See also: StackInhibit.
Further Examples
StackInhibit prevents Print from being included on the stack.
In[1]:= 
{CompoundExpression, f, g}
StackBegin[
expr
] uses a fresh stack in the evaluation of expr.
In[2]:= 
{g, h}
Out[2]= 
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