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 USAGE:
 ipconfig [/? | /all | /renew [adapter] | /release [adapter] |
 /flushdns | /displaydns | /registerdns |
 /showclassid adapter |
 /setclassid adapter [classid] ]
 
 where
 adapter      Connection name
 (wildcard characters * and ? allowed, see examples)
 
 Options:
 /?        Display this help message
 /all      Display full configuration information.
 /release    Release the IP address for the specified adapter.
 /renew     Renew the IP address for the specified adapter.
 /flushdns   Purges the DNS Resolver cache.
 /registerdns Refreshes all DHCP leases and re-registers DNS names
 /displaydns  Display the contents of the DNS Resolver Cache.
 /showclassid Displays all the dhcp class IDs allowed for adapter.
 /setclassid  Modifies the dhcp class id.
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