Saving a file without unloading the original

I want to know if it is possible to copy a workbook within Excel.

I am not talking about Workbook.SaveCopyAs, which takes the active workbook and saves another copy somewhere, but the result is only one copy in memory, the one with the new name.

I am trying to avoid reloading the original file because this is being done over a network that has more bugs than a third world tenement house.

Any way to do it? Copy a workbook within an instance of Excel (name won't matter, especially if I can specify one)?

FileCopy ActiveWorkbook.FullName, TargetPathName

That just copies the file in the location, right? I know you can put it elsewhere. It doesn't load a copy into memory in Excel.

I was hoping to copy the file in memory in Excel, so that at the end of the process there are two instances of the file in memory.

That way, I can have a master file, make a copy in memory, then edit the copy to be saved to the new filename. Rinse and repeat.

If I have to create a second instance of Excel, I suppose I could do that, but I wouldn't think that should be necessary.