In the code, there is "#ifdef _7Z_VOL".
But in the project of "Alone.dsp" (4.09Beta) , "_7Z_VOL" is not defined.
Does this mean that 7za do not support splitting of ".7z" archive ? And will not support this feature ?
I wrote about that.
_7Z_VOL is for native .7z volume support.
It's not finished still.
So now 7-zip uses .7z + .split.
If native .7z volume will be finished, you will be able to use .7z + .7z. It means that you will have archive inside archive, but 7-zip can operate them in one step.