Some info
Registry Values and Levels
The various aspects of pop-up manager are controlled by values in the registry under HKCU\Software\Microsoft\Int ernet Explorer\New Windows. The registry values are all dword values, unless noted. Values are all either 0 or 1, unless noted.
PopupMgr - Whether the pop-up blocker feature is enabled or not. This is the checkbox on the privacy tab of the Internet Control Panel.
PlaySound - Whether or not a sound should be played when a pop-up is blocked. This sound is set in the Sound Control Panel.
ApplyToWebOC - Applications hosting the webbrowser control only get pop-up blocking if they opt in. This forces pop-up blocking on non-opted-in apps when true.
UseSecBand - Whether or not pop-up blocker notifications should appear in the Information Band.
AccUserInitOnClick - Turns off or on an app compat work-around for some Accessibility Aids. This is on by default.
Balloon - Set when the balloon notification has been shown. Not a very interesting value, listed here for completeness.
BlockHTMLDialogs - Whether or not to treat HTML dialogs as pop-ups.
UserInitTimeout - Number of ms in the timeout period when the UseTimerMethod value is set (see below).
The biggest changes for SP2 is the creation of multiple levels of pop-up blocking. This is visible in the advanced pop-up blocking settings dialog (Tools->Pop-up Blocker->Pop-up Blocker Settings...). The levels are high, medium and low. The text descriptions of the levels were limited by the size of the box and the length of the text when localized to languages such as German. I will provide more details. The levels are pre-set combinations of the following values. Please note, these may change between now and the final release of SP2.
BlockUserInit - Whether or not to block windows deemed to be the result of a user initiated action. When on, pop-up blocking is hardcore. Default is off.
UseTimerMethod - Whether or not to use a timer to detect user initiated actions. Some sites do things asynchronously to mouse clicks... mostly sites where you submit data which results in a popup.
UseHooks - Whether or not to hook messages going to ActiveX controls. If this is false, then the control may not be able to open a new window.
AllowHTTPS - Whether or not to blindly allow pop-ups from sites using https.
The default values are High: T,F,F,F; Med: F,F,T,F; Low: F,T,T,T.
If you go change one setting by hand and it does not match the template for any of those levels, the level will show as “Custom” in the settings dialog.
The only other key to note is the Allow subkey. This is just a list of domains in the whitelist.
