Siemens SIMATIC NET Manual page 259

New as of Windows XP + SP2:
As of Service Pack 2 for Windows XP, you can also set the limit for applications
that specify their own permissions.
Communication over OPC requires the following security limits:
S Local and remote access for the ANONYMOUS LOGON in Access Permission
You should set the following permissions for the applications used (for example,
OPC.SimaticNET) (see 18.4 and 18.6.4):
S Local and remote launch for Anonymous Logon in Launch Permission
S Local and remote activation for Anonymous Logon in Launch Permission
These settings are implemented and the touch of a button by "Configuration
Console" (see 16.2.8).
Commissioning PC Stations - Manual and Quick Start
Release 5/2005
C79000-G8976-C156-07
18 DCOM Settings with the dcomcnfg System Program
259