How to disable/hide IE7 address bar:
In Internet Explorer 7, you can use the "NoNavBar" registry value to disable the Address bar.
For a “Per User” setting, the value is located in the following key:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Toolbars\Restrictions]
Value name: NoNavBar
Value Type: DWORD
Data: 0x00000001
For a “Per Machine” setting, the value is located in the following key:
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\Toolbars\Restrictions]
Value name: NoNavBar
Value Type: DWORD
Data: 0x00000001
http://support.microsoft.com/default.aspx/kb/944816
For IE6SP1,
http://support.microsoft.com/default.aspx?scid=kb;EN-US;823057