>>>Any added property would only be available during the session that called the AddProperty
>>
>>Yes, I understand this. But they aren't available in CURRENT session outside the DLL
>>
>>For example :
>>.....

>I believe this is by design. The AddProperty would only be available during the method call that called it.

Well, you don't believe me :-))) Try the simple test
1) Create in VFP DLL dlltest with 1 object - testdll
2) Add method test
Lpara what
return pemstatus(This,what,5)
3)Build DLL
4) In Command Window
oTest=CreateObject("dlltest.testdll")
oTest.AddProperty("NewProperty")
*** New property added, but we can't get it!
oTest.NewProperty="!!!!!" && error
*** But we may sure that Newproperty exist!
oTest.Test("NewProperty") && retu .T.

Any comments?