This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
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ReturnPacket

ReturnPacket[expr]
is a MathLink packet that contains the expression expr, the result of an EvaluatePacket evaluation.
Launch a subsidiary Mathematica kernel process:
Read the first packet:
Write the expression to the link without evaluating it:
The result is a ReturnPacket expression:
Close the link:
Launch a subsidiary Mathematica kernel process:
In[1]:=
Click for copyable input
Out[1]=
Read the first packet:
In[2]:=
Click for copyable input
Out[2]=
Write the expression to the link without evaluating it:
In[3]:=
Click for copyable input
The result is a ReturnPacket expression:
In[4]:=
Click for copyable input
Out[4]=
Close the link:
In[5]:=
Click for copyable input
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