What's New in the C API for Excel

Applies to: Excel 2013 | Office 2013 | Visual Studio

In conjunction with Microsoft Excel 2013, the Microsoft Excel 2013 XLL Software Development Kit (SDK) includes support for the following features.

New Functions

The Microsoft Excel 2013 XLL SDK supports calling back to all of the new worksheet functions in Excel 2013. For more information about calling Excel 2013 functions, see Calling into Excel from the DLL or XLL.
Asynchronous User-defined Functions

Excel 2013 supports calling user-defined functions (UDF) asynchronously, which can improve performance by enabling several calculations to run at the same time. For more information about asynchronous UDFs, see Asynchronous User-Defined Functions.
Cluster Connectors

Cluster connectors enable UDFs to run on high-performance compute clusters. For more information about creating cluster connectors, see Developing Excel Cluster Connectors.

Note

XLL add-ins that you intend to run on compute clusters must call only cluster-safe functions. For more information about the functions you can use, see Excel XLL SDK API Function Reference and Cluster Safe Functions.
64-bit Support

You can now compile and link both 32-bit and 64-bit XLLs. For more information, see Creating XLLs.

See also