Showing any IP config on XP Pro will only give you Layer 3 information. VLANs are Layer 2 properties of the packet. If your PC connects to a managed switch, the switch port you connect to is going to tag your traffic. Very rarely does the PC even know it is on a VLAN. On rare occasions, if the NIC has the configuration parameters, you can tag traffic from the PC. You can only view the VLAN your tagging under the advanced settings of the Network Adapter.