How to Open a Port on a MacBook

Click 'System Preferences' from the Dock and select the 'Sharing' icon.
Check each box to enable sharing for the type of content you want to share. For example, check the 'File Sharing' box to enable File Sharing.
Select the 'All Users' radio button to allow access to anybody. Select 'Only These Users' to allow access to only the listed users. If you want to add users, click the '+' button, select a user or group from the Users & Groups list and click 'Select.'
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How to Use a Mac Laptop As a Hotspot

Connect to the Internet on your Mac laptop and open any web site in a browser to confirm that the connection is good.
Open 'System Preferences,' then click on 'Sharing.'
Select the check box for 'Internet Sharing' on the left side of the Sharing preferences, then choose your incoming Internet connection from the drop-down menu.
Click the check box for 'AirPort' in the list of outgoing ports over which you can share your connection. AirPort will not appear if it is chosen as the incoming connection. Your Macintosh will then appear as an available wireless hotspot.
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How to Lock iPhoto Albums (5 Steps)

Click the iPhoto icon in your dock to launch the program.
Select 'iPhoto' from the menu, then scroll to 'Preferences.'
Click the 'Sharing' tab in the toolbar.
Check the box next to 'Share My Photos.' Choose to share your entire library, or select certain albums by clicking the radial button next to your preference.
Check the box next to 'Require password,' and type your password in the text box.
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How to Speed Up Download Speeds on Mac (4 Steps)

Change your Internet connection. This is one of the only sure ways to speed up your downloads on a Mac. If you have a cable connection, consider switching to DSL. Even though cable can be faster, the more people connected in a given area, the more bandwidth is used and the slower the download speeds are for you. While DSL is constant, since you are not sharing your connection with anyone else, if you have DSL, consider upgrading the number of Mbps you can download. If you go from 1.5 to 3 or 5, you will notice a difference.
Open ports on your computer. This will allow the ports that you are downloading on to have more access to your computer and therefore download more quickly. Open “System Preferences” in the Apple menu.
Click on “Sharing” and select “Firewall.”
Click “New” and select “Other” from the drop-down menu. Input “6881-6889” in the “TCP Port Numbers” and “UDP Port Numbers” boxes and add a description. Press “OK” and check the new port to open it.
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How to Play Music and Audio Sound Remotely From a PC on an iPad

Download the iTunes app 'Remote' to your iPad from the iTunes Music Store.
Launch iTunes on the PC that you want to play music from.
Enable Home Sharing by clicking 'Advanced' and 'Enable Home Sharing' in the pull-down menu at the top of the iTunes window.
Launch the 'Remote' app on your iPad.
Click the icon that looks like a cog at the upper-right hand corner of the app to display the settings menu. Click 'Home Sharing' to enable remote playback through your iPad.
Click the iTunes icon that appears within 'Remote.' This will display the iTunes library of the PC on which you enabled Home Sharing.
Select any song through your iPad to begin playing it back through your PC.
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How to Remotely Activate a Macbook Webcam (12 Steps)

Click the 'Apple' logo on the menu bar of the desktop of the MacBook that you want to connect to.
Select 'System Preferences' from the drop-down list, then click 'Sharing' in the Internet and Network section. The Sharing window opens.
Click the 'Screen Sharing' check box in the box on the left side of the window.
Click the 'Computer Settings' button, then click the 'Anyone May Request Permission to Control Screen' check box, then click 'OK.'
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How to Share a MacBook With Another Laptop

Select the “Apple” menu in the upper left corner of the Mac OS X desktop. Select “System Preferences.”
Select “Sharing.”
Place a check next to “File Sharing” (by clicking the box) to turn file sharing on. Make note of the “Computer Name” as this is what the MacBook will be listed as over the network.
Click the “+” button beneath “Shared Folders” to add the folders you’d like to share over the network with the other laptop computers. By default, the “Public” folder is shared.
Select “Options...” and then enable “Share files and folders using AFP” to easily share your files with other Apple computers over the network. If you are planning to share your files with a Windows computer, enable “Share files and folders using SMB (Windows).' You will need to enable a user account for Windows sharing. Turn on the account you wish to share (by clicking the box) and enter the password as prompted. Click “Done” to apply the changes and close “System Preferences.”
Select “Network” from the Finder’s “Go” menu bar on the laptop you are using to connect to the MacBook you just configured. The MacBook will be listed and accessible for file sharing (provided they are on the same network). Open “My Network Places” (or “Network” in Windows 7) within Windows Explorer to view and access the MacBook from a Windows machine. You will need the user account and password to gain access.
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