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Creating a Custom Filter Level
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Pop-up Blocker s filtering behavior is determined by five DWORD values of the registry key HKCU\Software\Microsoft\Internet Explorer\New Windows. Those values, each of which can be set to 0 (no) or 1 (yes), are as follows:
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BlockControls This setting, newly added in Internet Explorer 7, controls pop-up windows generated by ActiveX controls. It is set to 1 in High level only.
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BlockUserInit This determines whether Pop-up Blocker suppresses windows arising from clicks on links within a website. In the High level, BlockUserInit is 1; in the other two levels, it is 0. UseTimerMethod Some pop-up windows appear not as a result of clicked links but of data submitted on web forms. With UseTimerMethod set to 1, such popups are permitted; otherwise, they are suppressed. UseTimerMethod is set to 0 in the High and Medium levels. UseHooks This value, if set to 1, enables Internet Explorer to monitor messages sent to and from ActiveX controls by a website you visit. If UseHooks is set to 0, most ActiveX controls are suppressed as pop-ups. UseHooks is 0 only in the High level. AllowHTTPS This value, if set to 1, causes Pop-up Blocker to snooze when you visit a secure site. AllowHTTPS is set to 1 only in the Low level.
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The five registry values and their standard settings are summarized in Table 6-1.
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Table 6-1. Registry Keys That Control Pop-up Blocker Filtering Behavior
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Standard Filter Level Setting Registry Value AllowHTTPS BlockControls BlockUserInit UseHooks UseTimerMethod High 0 1 1 0 0 Medium 0 0 0 1 0 Low 1 0 0 1 1
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You can create a custom filter level by using Registry Editor to change one or more of these values. If the four values do not conform to one of the three standard constellations shown in Table 6-1, the Filter Level drop-down list in the Pop-up Blocker Settings dialog box displays Custom.
Allowing Pop-ups from Specific Sites
Because some websites might not function properly if they aren t allowed to generate pop-ups, and because you might actually welcome pop-up advertising from particular sites, Internet Explorer s Pop-up Blocker can maintain an exception list of exempted URLs. These URLs are user-specific and are maintained as values in the registry key HKCU\Software\Microsoft\Internet Explorer\New Windows\Allow.
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Blocking Pop-Up Windows
If Pop-up Blocker suppresses a pop-up from a site that you want to be on the exception list, click the Information bar at the top of the screen, and choose Allow Pop-ups From This Site. If you know in advance that you want to exempt a site, choose Tools, Pop-up Blocker, Pop-up Blocker Settings. In the Pop-up Blocker Settings dialog box, enter the address of the website you want to exempt, and then click Add. Pop-up Blocker normally naps whenever you visit sites in the Local Intranet security zone, on the assumption that sites inside your own network are implicitly trustworthy. If you want to apply the blocker to this security zone, follow these steps: 1. Choose Tools, Internet Options, and click the Security tab. 2. Select the zone you want to adjust, and click Custom Level. 3. In the Miscellaneous section of the Settings list (it s near the bottom of the list), under the heading Use Pop-up Blocker, select Enable.
Configuring Notification Options
When Pop-up Blocker prevents a window from appearing, you are informed, by default, in the following ways:
An Information bar appears.
An icon appears in the status bar.
A sound is played.
To suppress either the Information bar or the notification sound, choose Tools, Pop-up Blocker, Pop-up Blocker Settings. Then clear one or both of the check boxes in the Notifications and Filter Level section of the Pop-up Blocker Settings dialog box.
INSIDE OUT
Change the blocked pop-up sound
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If you don t fancy the sound that Internet Explorer uses to announce a blocked pop-up, you can assign a different sound via the Change System Sounds option in the Hardware And Sound section of Control Panel. You ll nd the event you need to con gure Blocked Pop-up Window under the Windows Explorer heading. (Internet Explorer doesn t have its own heading in this dialog box.)
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