Windows has a built-in service called Remote Desktop, which connects two computers over a network. Once connected, you'll see the remote computer's desktop as if you were sitting right in front of it, and have access to all its programs and files. These instructions describe how to configure the remote computer settings to allow a connection from another location, such as your home. It also covers how to make the connection from home, using VPN and the IP address of the host PC.
Steps 1-5 pertain to your office computer. The remaining steps are for your Mac.
To locate your office computer's IP address:
Click on the Windows menu button, then in the Search box, type CMD and then press Enter.
In the command prompt window, type ipconfig and press Enter. Write down your IPv4 address (it should be 12 digits total, starting with 128.180) so you can reference it when you're at your Mac later.
This concludes the steps you need to take on your office PC.
If you do not already have Microsoft Remote Desktop installed, open the App Store (either from the Apple menu or the Applications folder). Once in the App store, search for "Microsoft Remote Desktop." It is a free app from Microsoft Corporation. Click the blue button labeled "Install." Depending on your Internet connection speed it may take a minute or two to complete the installation. The blue button label will change to "Open" when it is finished installing. Open Microsoft Remote Desktop.
To configure the remote desktop connection you'll need the IP address from Step 5. Fill out the fields as follows:
Connection name: Work PC
PC name: 128.180.X.X
Gateway: leave as "No gateway configured"
User name: AD\xyz123
Password: The password for your Lehigh account
Leave the rest of the fields at their default values.