In IE versions 7 - 8 the standard Command bar in IE is usually too narrow to display the HttpWatch button - requiring a click on the toolbar chevron:
It is possible to alter the order of the buttons on the IE toolbar so that the HttpWatch button is always visible by following these steps:
The minimalist user interface in IE 9 no longer has the Command bar displayed by default so only the standard Home, Favorites and Tools buttons are displayed. The HttpWatch toolbar button can be added to the IE 9 command bar but you would first need to make the Command bar visible:
Then use the 'Add or remove commands...' menu item:
To open the Customize toolbar window. Find the HttpWatch button in the left hand list and enable it by adding it to the right hand list:
The HttpWatch button will then be available for use on the Command bar: