Yes, the DASL name includes the GUID and id.
Look at a message which has your custom property set with OutlookSpy (url
below) - click IMessage, locate the property, look at the DASL edit box on
the right hand side of the window. You can hardcode that DASL name in your
code.
Setting a property is not any different from reading it:

RDOMail.Fields("http://schemas.microsoft.com/mapi/id/{00062008-0000-0000-C000-000000000046}/8582000B")
= SomeBooleanValue

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

"j" wrote in message
ups.com...

I see, but Dmitry in DASL 8582000B is my PropTag?? Do you mean that i
should store it??
I don't inderstand, Also in your samples there are only getters of
properties and no setters.


Thanks in Advance.