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If you have weak passwords (or no password), then others could gain access into your file system. There have also been a few exploits specifically targeting AFP that have been released. If you have weak passwords (or no password), then others could gain access into your file system. Additionally there are a number of vulnerabilities in the CVE database for Samba. Poorly written web code and Apache configuration could lead to vulnerabilities on your system. Systems with SSH exposed to the Internet are prone to brute-force attacks, where an attacker attempts repeatedly to guess your password. This will show up in your logs, waste your bandwidth, and, if you have weak passwords, give an attacker full control over your computer. Additionally, while strong passwords do mitigate the chance of success they do not obviate it.

let dh = float32(plotBox.Height) / (hi - lo) let sx = int(pixelsPerUnit * i) let dx = int(pixelsPerUnit * (i + 1.0f)) let sy = int(dh * (data.GetValue(pos) - lo)) let dy = int(dh * (data.GetValue(pos + int64 timePerUnit) - lo)) g.DrawLine(linePen, sx, sy, dx, dy); drawSamples (i + 1.0f) (pos + int64 timePerUnit) drawSamples 0.0f initView

Windows Sharing (SMB)

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Flickering is a very annoying phenomenon of graphical applications. It happens when two updates of a graphical element are interleaved by a refresh of its background. The graphic adapter sends the video signal to the display, reading bytes from video memory at a given frequency that is different than the update frequency of the paint message. Flickering happens during animations when a pixel is cleared with the background color and then with the desired one. The graphic adapter may display the pixel before the update, making it blink. A standard technique to avoid this phenomenon is known as double buffering: it consists of performing the drawing primitives into a bitmap offscreen; then, when the entire drawing is finished, the bitmap is drawn. You can easily implement double buffering explicitly, although modern frameworks provide support for it. The example uses the SetStyle method inherited from UserControl to enable implicit support for double buffering. If you comment the two invocations to that method, you see flickering in action.

The Search button does just what you d think it would do. It opens up a search box. The Search button doesn t just search the Web. It also searches items on your phone. This is very handy if you re looking for an e-mail message that could be in one of three inboxes, or trying to find an elusive app you ve downloaded.

Enable when you want Windows users to have access to files hosted by your computer. Enable when you want to run your system as a web server. Enable when you want a command-line or Secure Shell (SSH) interface into your system.

The following code uses the control that defines the application shown in Figure 11-6: let let let let let form = new Form(Text="Chart test",Size=Size(800, 600),Visible=true,TopMost=true) graph = new GraphControl(VisibleSamples=60, Dock=DockStyle.Fill) properties = new PropertyGrid(Dock=DockStyle.Fill) timer = new Timer(Interval=200) container = new SplitContainer(Dock=DockStyle.Fill, SplitterDistance=350)

Personal Web Sharing (WWW port 80) Remote Login (SSH port 22)

// We use a split container to divide the area into two parts container.Panel1.Controls.Add(graph) container.Panel2.Controls.Add(properties) // Configure the property grid to display only properties in the // category "Graph Style" properties.SelectedObject <- graph let graphStyleCat = (CategoryAttribute("Graph Style") :> Attribute) properties.BrowsableAttributes <- AttributeCollection([| graphStyleCat |]) form.Controls.Add(container) let rnd = new Random()

let time = ref 0 // A timer is used to simulate incoming data timer.Tick.Add(fun _ -> incr time let v = 48.0 + 2.0 * rnd.NextDouble() graph.AddSample(int64(!time),float32(v))) timer.Start() form.Disposed.Add(fun _ -> timer.Stop()) The form uses a SplitContainer control to define two areas, one for GraphControl and the other for a PropertyGrid control. A timer object is used to add samples periodically, and you use the AddSample method to add random samples to the control.

FTP Access (FTP port 21)

The Menu button is the Android equivalent of right-clicking. It gives you a contextsensitive menu of options that apply to whatever is running on your screen. The Menu button options vary by application, so some Menu options are more helpful than others. If you re ever stuck trying to find an option, try pressing the Menu button.

PropertyGrid is a graphic control that lets you inspect object properties at runtime and change them, as shown in the right side of the window in Figure 11-6. You set the SelectedObject property to indicate the control to display, in this case the GraphControl .

Enable when you want to turn FTP has not changed in 30+ years. Need we say more your system into an FTP server. Weak passwords and poor configuration could give an attacker access to everything on your computer.

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