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The more formal way of attaching a folder action script to a folder is to use the Folder Actions Setup application, which you met earlier in this chapter Folder Actions Setup is good when you re attaching one or more scripts or you want to get an overview of all the folder actions set up on your Mac Here s how to attach a folder action script to a folder using Folder Actions Setup:

Most monitoring systems consist of radio transmitters and receivers Some systems employ lasers at IR or visible wavelengths A few employ wire or cable links Some have mechanical hardware, such as robots, that are controlled by the signals reaching the receiver Here are a few specific examples of monitoring systems

Key Lookup [AdventureWorks].[Production].[Work... Cost: 99 %

1 Open the Folder Actions Setup application in one of these ways:

Figure 3 shows the graphical query plan for listing 1. If you inspect the query plan, you will see that the optimizer estimates that 59 rows will be selected. If it uses the nonclustered index and clustered index seeks to look up the corresponding rows, it is estimated to cost a little over 59 reads, one read per row. If it had to scan the entire clustered index, it would cost a little over 523 reads, one read per page of the table. The optimizer makes the right choice, as displayed below. To determine the number of physical reads, you can use SET STATISTICS IO ON before running the query, or use SQL Profiler. If SQL Server s cache is empty and you run this example, you will see only three physical reads and four read-ahead reads, a total of seven reads. (you could get slightly different results if you have worked with the AdventureWorks database before).

Baby Monitor A short-range AM or FM radio transmitter and receiver can be used to listen at a distance to the sounds in an infant s room The transmitter contains a sensitive microphone, a whip antenna, and a power supply The receiver is battery-powered and portable It has a short antenna, similar to the antennas on cordless telephone sets The receiver can pick up signals from the transmitter at distances of up to about 50 m (165 ft) The signals pass easily through the walls, ceilings, and floors in frame houses A so-called baby monitor is subject to interference from other units that might be operating nearby on the same channel Some baby monitors have multiple, selectable channels to help combat this problem If interference occurs, the channel can be changed Communications privacy and security are not a concern Smoke Detector Smoke and fire change the characteristics of the atmosphere Smoke consists of solid particles, and fire burns away oxygen and produces other gases such as carbon dioxide, carbon monoxide, and sulfur dioxide These changes can be sensed, and alarms set off if the changes exceed certain limits

Let s change our example to select everything except this range of EndDates, as shown in listing 2. That would select 72,503 rows (99.88 percent).

Press z-SPACEBAR to open Spotlight, start typing folder actions, and then open Folder Actions Setup from the hit list It s usually the top hit, so this is normally a quick way of opening the application Open your Applications folder, expand the AppleScript folder, and then doubleclick the Folder Actions Setup icon

WorkOrderID, OrderQty, EndDate Production.WorkOrder EndDate < '20031101' EndDate >= '20031102'

A smoke detector senses changes in two characteristics of the air: the dielectric constant (an expression of the extent to which pollutants increase the capacitance of the air) and the ionization potential (an expression of the extent to which pollutants change the voltage necessary to produce a spark that jumps through the air) Smoke and fire almost always affect one or both of these parameters Figure 34-1 is a functional diagram of a smoke detector that operates by sensing changes in the dielectric constant of the air Two electrically charged plates are positioned a small distance apart The plates, and the air between them, form a capacitor A source of dc is connected to the plates Normally, the plates retain a constant charge, and the current in the circuit is zero If the dielectric constant of the air increases, the capacitance changes, causing a small, momentary electric current to flow This current can be detected, and the resulting signal sets off an alarm The signal can also actuate a robotic system, such as a group of water sprinklers