C# Constants:

        public class GetWindowConstants {
            public const uint GW_HWNDFIRST = 0;
            public const uint GW_HWNDLAST = 1;
            public const uint GW_HWNDNEXT = 2;
            public const uint GW_HWNDPREV = 3;
            public const uint GW_OWNER = 4;
            public const uint GW_CHILD = 5;
            public const uint GW_ENABLEDPOPUP = 6;
            public const uint GW_MAX = 6;
        }

        //Windows version <= 0x0400
        public class GetWindowConstantsObsolete {
            public const uint GW_HWNDFIRST = 0;
            public const uint GW_HWNDLAST = 1;
            public const uint GW_HWNDNEXT = 2;
            public const uint GW_HWNDPREV = 3;
            public const uint GW_OWNER = 4;
            public const uint GW_CHILD = 5;
            public const uint GW_MAX = 5;
        }

VB Constants:

TODO

Notes:

None.