WMI can query remote computer if the user has the appropriate permissions, by default domain admin. However, you can use fnWMIAuthentication() - Authenticates against a local or remote WMI provider to authenticate with different credentials.

You cannot remotely query Windows 9x computers unless you correectly configure a couple of components manually that will ultimately allow remote admin access to Windows 9x computers
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There are two types of vessels, submarines and targets.