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that just mean that if you have a big string and only want to replace a snippet in it, you can using this method
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The syntax for the .write clause is <br />
<br />
.write(expression, @offset, @length)<br />
<br />
What does the @offset and @length do?
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The syntax for the .write clause is 

.write(expression, @offset, @length)

What does the @offset and @length do?

SQL .Write

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.

Microsoft SQL Server 2008

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.