Details

The integer n given to SetStreamPosition should usually be a value obtained from StreamPosition.
SetStreamPosition[stream,0] sets the current point to the beginning of a stream.
SetStreamPosition[stream,Infinity] sets the current point to the end of a stream.

Examples

Open a stream:

Wolfram Language code: str = StringToStream["123 456 789"]

Read the first number from the stream object:

Wolfram Language code: Read[str, Number]

Modify the current point in the stream:

Wolfram Language code: SetStreamPosition[str, 7]

Read a number from the stream object:

Wolfram Language code: Read[str, Number]

Close the stream:

Wolfram Language code: Close[str]

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