How to Change the Default Wi

Launch 'System Preferences' from the Apple menu in the top left corner of the screen.
Select the 'Network' preference pane and click on the 'Advanced' button.
Drag the available networks in the 'Preferred networks' window to their desired order of importance. The network on the top of the list will always be the default Wi-Fi network when available.
Click on 'OK' to exit the screen and click on 'Apply' to save your changes.
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How to Change Color Depth (5 Steps)

Right-click on the open portion of the Windows XP desktop, choosing 'Properties.' Next, select the 'Settings' tab item. A drop-down menu will appear listing your choices for 'Color Quality.'
Changing the screen resolution within the 'Settings' area will affect the range of choices available within the 'Color Quality' drop-down. Depending on how much graphic memory is available, the range of color-depth possibilities could shrink. Reducing screen resolution does the opposite.
Vista users should click on the 'Start' button. Click on 'Control Panel.' Click 'Appearance and Personalization.' Choose 'Personalization' and select 'Display Settings.' Pick the 'Colors' drop-down menu, selecting the highest available color-depth (often 32-bit).
Mac OSX users should select the 'System Preferences' item under the Apple menu. Pick the 'Displays' icon. Choose a preferred screen resolution under the 'Resolutions' area, then select the number of colors to display under the 'Colors' item.
CRT display users should proceed as was explained for LCD users.
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How to Invert Color on a MacBook Pro Monitor (7 Steps)

Click the 'Apple' menu at the top of the screen and then click 'System Preferences.'
Click 'Universal Access' in the 'System Preferences' window.
Click 'Seeing' in the 'Universal Access' window to view a list of visual options.
Click 'White On Black' in the 'Display' section of the window to invert the color of the display.
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How to Remove an Icon From the Toolbar

Open the Windows program where the toolbar is located by selecting its name within the 'Start' menu.
Right-click anywhere in the open area on the right side of the 'Help' menu. Scroll down and select 'Customize.' Wait for the 'Customize' dialog box to load.
Select and drag the toolbar icon you want removed to the 'Customize' dialog box. Repeat for each icon you want removed. Select 'Close.'
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How to Use Excel on a Mac

Open Excel.From the Mac OS X desktop, double click on the hard drive icon in the top right corner. From the list of folders, select 'Applications' and then select 'Microsoft Office.' The Excel application will be identified by an animated, cartoonish green 'X' and can be opened by double clicking this character.
Create a new spreadsheet.When Excel first opens, a new, blank spreadsheet will be automatically created and given a default name of 'Worksheet 1.' As such, no steps are required to create a basic new spreadsheet.
Save the spreadsheet.From the Apple menu at the top of the screen, select 'File' and then select 'Save As' to indicate to Excel that you want to save your spreadsheet. A dialogue box will appear in which you can give your file a name and select a location on your hard drive or network to save the file. Click 'OK' to save your worksheet.
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How to Connect a Laptop to 3G (5 Steps)

Insert the SIM card into the USB modem, if your carrier requires it. Carriers like AT&T and T-Mobile use SIM cards—a small, fingernail-sized card that contains your personal cellular information. Remove the plastic cap from the modem and insert the SIM card into the slot until it clicks into place. Replace the cap.
Turn on the laptop. Insert the USB modem into an open USB port on the laptop.
Install the software by using the automatic installation wizard. The wizard should start once the laptop recognizes the presence of the new modem. Follow the prompts, accept the license agreement and click 'Install' until a window tells you that the installation is completed. Restart the laptop if prompted.
Connect to 3G with the USB modem by opening the software program that it installed. This can usually be found as a shortcut on the desktop or by opening the Start menu, clicking on 'All Programs' and looking for an application that has the name of your wireless carrier in it. Look for an option to 'Connect.' Choose this to activate the connection.
Open a web browser to test the modem.
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How to Open Email Paper Clips

Open your email program and open the email that contains the attachment. There may be a small paper clip icon next to the email in the list. That one is just to tell you there is an attachment on the email, but you will need to open the email first to access the attachment.
Click the large paper clip icon on the individual email. The attachment may be sent through a virus scanner before becoming available, so you may need to wait a little bit before it opens. If you already have a program that can view it, it should open up. If you receive a warning such as 'blocked' or 'malicious program,' you shouldn't open it, because there is a danger of a virus. If you receive an error stating 'Windows can't open this file...' then you may need additional software or to set an association.
Look under the error message for the full file name of the attachment. The extension, or the part ofter the '.', will cue you in on the type of program required. .Jpg, .gif, .png, .jpeg and .tif require a graphics program. .Doc and .docx requires Microsoft Word or Open Office. .Xls requires Excel or Open Office. If in doubt, you can search Google for the extension to gain insight as to its requirements. Use the format '.ABC extension' in your search.
Click the circle next to 'Select a program from a list of installed programs' and click 'OK.'
Click the appropriate program, such as a graphics program, word processor, etc, and click 'OK' to open the file with the selected program. If you don't see the program, you can click 'Browse' to locate it manually in a Windows Explorer type setting. If you check 'Always use the selected program to open this kind of file' then Windows will remember your settings and use them next time it encounters the same file extension.
Associate a file type manually in Windows 7 by clicking the Start orb, typing 'Make a file type always open in a specific program' and pressing Enter. On the resulting screen, you can select the file extension and click 'Change program' at the top to change the associated program, similar to the previous step. This is also useful if you accidentally associate an inappropriate program with an extension.
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