>>>>I want to try out this API function:
>>>>
>>>>ULONG WINAPI GetAdaptersAddresses(
>>>> _In_ ULONG Family,
>>>> _In_ ULONG Flags,
>>>> _In_ PVOID Reserved,
>>>> _Inout_ PIP_ADAPTER_ADDRESSES AdapterAddresses,
>>>> _Inout_ PULONG SizePointer
>>>>);
>>>>
>>>>How do I use that in VFP?
>>>>
>>>>See https://msdn.microsoft.com/en-us/library/windows/desktop/aa365915(v=vs.85).aspx for more detail
>>>
>>>If restricted to Vista and upwards, you may consider this alternative:
>>>
>>>

>>>CLEAR
>>>
>>>LOCAL WMIService, AllNetworkAdapters, NetworkAdapter, MACAddress
>>>
>>>m.WMIService = GETOBJECT("winmgmts:\\.\root\cimv2")
>>>
>>>m.AllNetworkAdapters = m.WMIService.ExecQuery("Select * from Win32_NetworkAdapter",,48)
>>>
>>>FOR EACH m.NetworkAdapter IN m.AllNetworkAdapters
>>>	m.MACAddress = m.NetworkAdapter.MACAddress
>>>	IF !ISNULL(m.MACAddress)
>>>		? m.NetworkAdapter.name + ": " + m.MACAddress + " (" + IIF(m.NetworkAdapter.PhysicalAdapter,"","not ") + "physical)"
>>>	ENDIF
>>>ENDFOR
>>>

>>>
>>>Complete set of properties at https://msdn.microsoft.com/en-us/library/aa394216(v=vs.85).aspx
>>
>>Thanks, I've never felt comfortable that the WMI will always be available. I may be wrong, but it can be disabled, can't it?
>
>Yes. But... https://msdn.microsoft.com/en-us/library/aa826517(v=vs.85).aspx

Yes, but I do not want to start something on a client's PC that their IT people have disabled, even if it's only temporarily.