what is system memory on MemoryMappedFile in VB.NET

Question

VB.NET Function Menual In visual studio, ''create or opens a memory-mapped file that has the specified capacity in system memory'',
Is the system memory RAM or C drive?

Answer 1

From https://learn.microsoft.com/en-us/dotnet/standard/io/memory-mapped-files -- "A memory-mapped file contains the contents of a file in virtual memory."

Memory-mapped files are backed by either an actual file on disk or the system page file.

I'm guessing that you are asking about non-persisted memory mapped files. So in that context, the phrase is referring to virtual memory that will be back by the system page file.