[PHP-WIN] PHP-WIN: Handle DCOM BSTR return value

[Khor, Eng Poh]

Hi,

I hope someone could help me with this. I have tried confirming my email addr with 
php.windows newsgroup but still...ko.

How could I get a return value from DCOM server defined as follow

[propget, id(0x00000002)]
HRESULT _stdcall About([out, retval] BSTR * Value );

In PHP, I defined

$objApp = new COM("ComSer.Common") or die("Unable to instantiate DCOM server");
$vVar = $objApp->About;
echo $vVar;

but it was giving me memory can't be written error.

But say if I create
$word = new COM("Word.Application");
echo $word->Version;                            //  This works. Why?

Thanks, I'd like to appreciate your reply in advance.

Regards,
Khor