>All the examples below returns a OLE error
>oUser = GETOBJECT("WinNT://SERVERH/RHDINF14/hlizarraga,User")
>oUser = GETOBJECT("WinNT://Informatica/Rhdinf14/hlizarraga,User")

Are you sure you're not a domain user? In other words, even though I'm using the box //mydomain/mybox, I'm logged onto the domain server, not my box. Therefore, I'd have to use getobj("WinNT://mydomain/mikestew,user") and not getobj("WinNT://mydomain/mybox/mikestew,user")