Can Mac Address of two systems be same? Wireless connection issues

[avibky]

No avi even until i know it isnt possible. Even my pc can only be connected to net through my network adapter's mac address. If i connect some oher pc i cant use the net and hv to call them and they will allow that mac address. but when i again connect to my pc i hv to recall them. So until the network adapters is the same one mac address cannot be same as for as i know.