ConnType
Can have one of following values:

EXPLORER_BAR inf the toolbar button opens an Explorer Bar.

COM_OBJECT if the toolbar button implements a Com-object.

The COM object must implement IOleCommandTarget. If your COM object needs to access the DHTML Object Model of the page that Internet Explorer is looking at, you must implement IObjectWithSite. 
The implementations of IOleCommandTarget's methods are standard, except for IoleCommandTarget.Exec. The COM object's IOleCommandTarget.Exec method is called with nCmdID=0 if the toolbar button or menu item is clicked. This difference allows developers to provide different behaviors for the toolbar button and the menu item.
When IObjectWithSite is implemented, Internet Explorer will call IOleObjectWithSite.SetSite and pass it a pointer to IShellBrowser.


EXECUTABLE if the toolbar button runs an .exe-file.

SCRIPT if the toolbar button runs a script-file.

BtnText
Set the value of BtnText to the label you want for the toolbar button.

StatusBarText
Set the value of MenuStatusBar to the text you want displayed in the status bar when the menu item is highlighted. This text should describe what the script associated with this menu item will do.

HotIcon
Set the value of HotIcon to the full path of the .ico file that contains the three color icons.

Icon
Set the value of Icon to the full path of the .ico file that contains the three grayscale icons.