Classic OPC Client SDKs and their UA options updated

Updates released for the OPCDA.NET, OPCAE.NET and OPCHDA.NET Client SDKs and the OPCDA.NET-UA, OPCAE.NET-UA and OPCHDA.NET-UA add-on options.

The Property ComApi.CoSetProxyBlanketDisable is now in all product variants with the default value true.
The ComApi.EnumComputers method improved to use DirectoryServices if Win32 NetServerEnum fails.
.NET2 DLLs included in the distribution for the maintenance of old applications.

The UA options have minor updates in the UA stack code.