Specifies whether the function is thread-safe (Excel 2007 and above only)

Remarks

If this property is set to true, then the function will be registered as a thread-safe function, which means that Excel can call the function on multiple threads simultaneously.

The default initial value for IsThreadSafe is controlled by the XLL+ General Options setting DefaultIsThreadSafe.

See Also

Function Model | Function Properties | Ensuring global data is thread-safe