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This app allows PowerPoint and Keynote presentations from the phone. It can be used to either lead or attend live conferences with invited attendees. Files must be uploaded to your MightyMeeting account first in order to be available as presentations. More information is available at www.mightymeeting.com. Oration Sensation is a presentation timer that offers vibrating timed alerts at preset intervals. You can save a list of presentation types, such as short sales pitch or conference presentation, and keep your phone in your pocket. The alerts will let you know when it s time to switch slides or move to Q&A. This lets you use your phone as a Bluetooth remote for PowerPoint presentations. Test it beforehand (obviously), because not all computer and device combinations will be compatible.

Note You need to add a user to Active Directory only once, regardless of the number of sites or lists to

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Figure 2-7. Debugger illustrating that a function does not reference a class instance The debugger shown in Figure 2-7 is distributed with Mozilla, and in the middle window on the left side is a reference to the this variable. The watch window illustrates that this does not reference an instance and is a plain, simple ScriptFunction. This means that even though the original function was associated with an instance of Asynchronous, when used as a callback the reference disappears. A solution would be to cross-reference a request with an Asynchronous instance that is stored in an array that is accessed to identify the request. Such a solution is complicated and relies on some global array. The solution is not a complex cross-referencing algorithm, but the use of a unique implementation detail of JavaScript. Look back at the implementation of Asynchronous_call, illustrated briefly as follows: function Asynchronous_call(url) { var instance = this; this._xmlhttp.open('GET', url, true); this._xmlhttp.onreadystatechange = function() { switch(instance._xmlhttp.readyState) {

First, the this variable is assigned to the instance variable The assignment is important because it is a variable that is managed by JavaScript. Second, the property onreadystatechange is assigned a dynamic anonymous function. An anonymous function is a function without an identifier, which contains only a signature and implementation. Using an anonymous function in the context of a function allows the referencing of variables in the anonymous function that were defined in the function itself. This means the variable instance is available for referencing in the anonymous function. What makes this feature a big deal is that when the anonymous function is called, the caller of Asynchronous_call will already have exited the function and be doing something else. The reason the local variable instance is still available is because JavaScript sees a reference and does not garbage-collect it until the this_xmlhttp instance is garbagecollected. Putting all of this together in the HTML code, the Asynchronous property complete is assigned the functions AsyncUpdateEvent and AsyncUpdateEvent2. Whenever any of these functions are called, the this references a valid instance of Asynchronous. Then the code that was referencing myState, which should have worked, would work. Looking at the HTML code, you can see that the AsyncUpdateEvent this references the variable asynchronous, and AsyncUpdateEvent2 this references the variable asynchronous2. Figure 2-8 shows the proof that the this variable is assigned.

Some Android variations have some slight differences in how their web browsers work, but they will all browse the Web. To launch the Android browser, just click the Browser app. By default, you ll see the Google home page, as shown in Figure 3 5. Some phone manufacturers may change the default home screen in favor of something else. You can change your default screen by long-clicking a bookmark. I ll explain this more soon. You can search for a site in the search box, or click the URL box to enter a new address. Some web pages display in a mobile-friendly format, but some are just regular web pages. You can make the tiny type displayed by them larger either by using the pinchto-zoom motion (available on some phones) or by tapping the screen and using the + and buttons to adjust the screen size.

Figure 10-4. Example Active Directory add user dialog box After adding a new external user, you are prompted to assign an initial password. You should check the Password Never Expires checkbox and uncheck the User Must Change Password At Next Logon checkbox. Leave the other two checkboxes unchecked. If you require users to change their password at first logon, they cannot access any secure sites because browsers don t provide the ability for users to change their password, and SharePoint will not allow them to log on until they do. This results in a Catch 22, in which the user is continually prompted to log in but never is authenticated by SharePoint. Figure 10-5 shows the Active Directory dialog box for setting the new user s password.

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