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Plug one end of the Ethernet cable into the square port on the back of your desktop's CPU box, then plug the other end of the cable into the square port on the side of your laptop. Click the Windows logo in the bottom-left corner of the screen. Doing this will search your computer for the Control Panel program. You'll find this at the top of the Start window. Control Panel will open. It should be on the left side of the Control Panel page. If your Control Panel page has "Small icons" or "Large icons" written in the top-right corner, skip this step. Doing so opens a list of all current connections, including your Ethernet connection to the laptop computer. It's a link below the current Internet connection in the Network and Sharing Center window. This is in the bottom-left corner of the window. You'll find this line of text in the middle of the window. Clicking it will select it. It's in the lower-right side of the window. Check the "Use the following IP address" box near the top of the page, then fill out the following fields:   IP address - Type in 192.168.1.1   Subnet mask - Type in 225.225.225.0   Default gateway - Type in 192.168.1.2 To do so:  Go to the Network and Sharing center in the same way that you did on the desktop. Open the Ethernet properties, select Internet Protocol Version 4, and click Properties  Check the "Use the following IP address" box at the top of the page. Type 192.168.1.2 into the "IP address" field. Type 225.225.225.0 into the "Subnet mask" field. Type 192.168.1.1 into the "Default gateway" field. Click OK twice. Click the Windows logo in the bottom-left corner of the screen. Click the folder-shaped icon in the lower-left side of the Start window. Click on a folder that you want to share from your desktop to your Mac computer. You can also create a new folder to share. To do so:  Click Share in the top-left side of the window. Click Specific people...  Click the drop-down arrow. Click Everyone  Click Share  Click Done when prompted. To do so:  Find the files that you want to share. Select the files. Press Ctrl+C to copy the files. Open the shared folder. Press Ctrl+V to paste the files. Go back to the Windows laptop on which you want to access the shared folder. Open Start, click File Explorer {"smallUrl":"https:\/\/www.wikihow.com\/images\/0\/0d\/Windowsstartexplorer.png","bigUrl":"\/images\/thumb\/0\/0d\/Windowsstartexplorer.png\/30px-Windowsstartexplorer.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Windows icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"}, click the desktop computer's name in the lower-left side of the File Explorer window, and double-click the folder. You may have to scroll down through the far-left column of folders to access the desktop computer's name. Select the files, press Ctrl+C, open a folder in which you want to store them, and press Ctrl+V. You can also add files from your laptop to the shared folder if you want to access them on the desktop computer.

Summary:
Connect the two computers with an Ethernet cable. Open Start  on the desktop computer. Type in control panel. Click Control Panel. Click Network and Internet. Click Network and Sharing Center. Click Ethernet. Click Properties. Click Internet Protocol Version 4. Click Properties. Change the IP address for your connection. Change the IP address on your laptop computer. Open Start  on the desktop computer. Open File Explorer . Select a share folder. Share the folder. Place files to share in the folder. Switch to the laptop computer. Open the shared folder. Move the shared files onto your laptop.