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You can establish zero, one, or several triggers for a task. If you don t set any triggers, you can still run the task on demand (unless you clear the Allow Task To Be Run On Demand check box on the Settings tab of the Create Task dialog box). This gives you a way to test a new task before committing it to a schedule, for example. If you set multiple triggers, the task runs when any one of the triggers occurs.

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This chapter covered a lot of ground in the areas of distributed computing and J2EE development. The goal was to give you an appreciation for the challenges you will face and the tools that will help you face them when building a J2EE-XML system. A distributed system is a set of independent processes that communicate with each other by passing messages over a communication channel. The client/ server and peer processing models are the most common architectures in use today, and they are often combined to create more flexible distributed systems. A distributed application relies heavily on a layered approach to software development using middleware. Middleware abstracts differences in computing environments and provides a common set of services for applications built on top of it. This overcomes the wide diversity among system components, which is the common challenge of devising distributed systems. This is the raison d tre of the J2EE platform, which is a vendor-independent form of middleware. The n-tier architectural model is a common, useful tool for building various types of application components. This model dissects the application into presentation, application logic, data, and service layers for purposes of analyzing

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To set up a trigger, click the Trigger tab in the Create Task dialog box, and then click New. On the New Trigger dialog box that appears (shown in Figure 30-5), choose the type of trigger you want from the Begin The Task drop-down list.

Figure 30-5 A task can ha e zero, one, or se eral triggers. Ad anced Settings options let you set delay, repeat, and expiration parameters.

Note the Advanced Settings options at the bottom of the dialog box shown in Figure 30-5. These choices, which let you establish delay, repeat, and expiration parameters (among other things), are not so easy to find when you re reviewing a task that you or someone has already created. They don t appear in the read-only version of a task s properties, and if you re-open the read/write version of the properties dialog box, you ll need to select a trigger (on the Trigger tab) and click Edit to see or change the advanced options. Triggering a Task on Schedule Time-triggered tasks can be set to run once or to recur at regular intervals. The choices are probably self-explanatory, with the possible exception of the Universal check box. Time triggers are governed by the clock of the machine on which the task is to run, unless you select this check box in which case they are triggered by coordinated universal time (UTC). You might want to go with UTC if you re trying to coordinate timetriggered tasks on multiple machines in multiple time zones.

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Triggering a Task at Logon Logon tasks can be set for any user or a specific user or user group If the user whose logon has triggered the task is not the user in whose security context the task is running, the task will be non-interactive in other words, essentially invisible (The user can note the presence of the task and terminate it by running Windows Task Manager, going to the Processes tab, clicking Show Processes From All Users, and answering the UAC prompt) Triggering a Task at Startup If you set a task to be triggered at startup, the trigger takes effect when you start your own computer (assuming you have Task Scheduler set to configure the local machine), but before you log on.

them money. Since it is difficult to steal and modify WML from a mobile device, we are only concerned with traditional, HTML web browsers. Modifying our XSLT version of the example to generate PDF instead of HTML involves two steps:

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