By default, this option is not set.

If this option is set, all the changes, made in the file system or the registry, are stored in the virtual environment. For example:

...
void main()
{
    BoxedAppSDK_Init();
...
    BoxedAppSDK_EnableOption(DEF_BOXEDAPPSDK_OPTION__ALL_CHANGES_ARE_VIRTUAL, TRUE);
    {
        // File 'virtual.txt' will be created as virtual

        HANDLE hFile = 
            CreateFile(
                _T("virtual.txt"), 
                GENERIC_WRITE, 
                FILE_SHARE_READ, 
                NULL, 
                CREATE_NEW, 
                0, 
                NULL 
            );
    }
    BoxedAppSDK_EnableOption(DEF_BOXEDAPPSDK_OPTION__ALL_CHANGES_ARE_VIRTUAL, FALSE);
...
}

...
var
    fs: TFileStream;
begin
    BoxedAppSDK_Init();

    BoxedAppSDK_EnableOption(DEF_BOXEDAPPSDK_OPTION__ALL_CHANGES_ARE_VIRTUAL, true);

    // File 'virtual.txt' will be created as virtual
    fs := TFileStream.Create('virtual.txt', fmCreate or fmOpenWrite);
    fs.Free();

    BoxedAppSDK_EnableOption(DEF_BOXEDAPPSDK_OPTION__ALL_CHANGES_ARE_VIRTUAL, false);
...
end;