PGM message not directly sent by XP

Hi,

I'm using PGM to send multicast messages in my application.

However it turns out that the first message is not actually put on the

wire immediately, but only if the application sends a 2nd message.

Then with the sniffer I see them both. So for now I have patched

my application to do just this: send the original message, and

then a message with just 1 byte. But I wonder why this should be

necessary anyhow. It just adds to the networkload, protocol stack

load, and the receivers must ignore the spurious messages.

So is this a bug in the MS PGM implementation, or correct PGM

behaviour?

Rob

BTW, and for those XP Embedded aficionados:

It is not sufficient to just add PGM as a component to XPE.

You also need a few additional registry keys in order to have

Winsock recognize PGM. And you don't need MSMQ at all.