Whath the heck does this do?

[Brian Schott via Digitalmars-d-learn]

alias extern(Windows) HRESULT fnNtQuerySystemInformation( uint 
SystemInformationClass, void* info, uint infoLength, uint* 
ReturnLength ) nothrow;

If you know, respond here or at the following bug report:

https://issues.dlang.org/show_bug.cgi?id=13309