Get the wireless adapter frequency-band mode in Windows 7

I have a dual-band 802.11n router operating in both frequency bands with the same SSID. My Windows 7 laptop has a dual-band wireless adapter. Is there a way to find out which frequency band is the one currently used by the client? Also, is there a way to set the preffered band?

Thanks.

EDIT1: The router is Linksys E4200 (V2) and I essentially want to keep the 2.4GHz band in the mixed-mode so that the legacy 802.11g devices can connect while allocating the 5.0GHz band for 802.11n devices. The laptop's adapter (Intel Centrino Ultimate-N 6300 ANG) can operate in both 802.11n modes.

EDIT2: Related topic

With most adapters you cannot do what you are asking. But it's pretty pointless trying anyway - by design the E4200 will try to use 5.0GHz for a connection if available. If you really want to be prescriptive you could use different SSIDs for 2.4 & 5.0GHz - surely easier than manually setting the frequency on a bunch of laptops even if it's possible.

Unfortunately, the GUI does not show the wireless band or channel, but the NETSH command will, as was mentioned above.

But it can be trimmed to just what is necessary:

netsh wlan show interfaces

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\>netsh wlan show interfaces
There is 1 interface on the system:
    Name                   : Wireless Network Connection
    Description            : Intel(R) Centrino(R) Advanced-N 6200 AGN
    GUID                   : 
    Physical address       : 
    State                  : connected
    SSID                   : 
    BSSID                  : 
    Network type           : Infrastructure
    Radio type             : 802.11g
    Authentication         : 
    Cipher                 : 
    Connection mode        : 
    Channel                : 11
    Receive rate (Mbps)    : 54
    Transmit rate (Mbps)   : 54
    Signal                 : 99%
    Profile                : 
    Hosted network status  : Not started

As can be seen here or here, 802.11n uses the 2.4GHz and 5GHz bands. In the U.S., the 2.4GHz frequency band has 3 non-overlapping 20MHz channels (1,6,11) out of 11 legal channels (1-11). In other world regions, legal channels run up to 13 or 14.

The 5GHz frequency band in the U.S. has 23 non-overlapping 20MHz channels numbered from 36 upward. Regulations in other world regions differ wildly, but channel numbers below 34 aren't legal anywhere.

Referring to the command example above, using the NETSH command above, if the channel is 1-14 then the wireless frequency being used is the 2.4GHz band. If the channel is 34 or higher then the wireless frequency being used is the 5GHz band.