A comprehensive guide to utilizing your keyboard and mouse across multiple PCs or Macs
Follow These Steps

Select the Best Method: Determine whether a hardware or software solution suits your needs best. Consider your personal circumstances to make the right choice.

Opt for a Software-Based Solution: Ensure that each computer you want to control has an active network connection, whether it's a local area network (LAN) for local control or an internet connection for remote access.

Get software and services for your computers. Consider providers like LogMeIn, offering various service levels from free options like LogMeInFree to premium choices such as LogMeInPro, which typically requires a monthly fee of around US$20 per computer. Choose the service level that suits your needs, create an account, and download/install the software.

Consider another software-based alternative called 'synergy,' an open-source solution that works across different operating systems. It's ideal for locally controlling multiple computers with a single keyboard and mouse, serving as a 'soft' KVM switch.

Explore a hardware-based solution with a 'KVM Switch' (Keyboard, Video, Mouse), which allows connecting multiple computer video inputs to a single monitor output. These switches accommodate various types of keyboard and mouse connectors, transitioning from PS/2 to USB ports. Ensure compatibility with your computer's connectors and consider cable length limitations when siting the hardware.

Procure any additional cables required to establish connections between the KVM and the computers and input/output devices. Ensure compatibility with your setup, considering factors like cable length and connector types.

Choose a product with support for your computer's operating systems and setup. Ensure that the KVM supports the required device drivers and switching mechanism, especially if you're using multiple operating systems across your computers.

Follow the manufacturer's instructions to install the KVM and software. Ensure proper installation to enable seamless operation. Additionally, consider using Windows Defender, an antivirus software built into the Windows operating system, to protect your Windows desktop computer or laptop from viruses. It's a reliable option that can safeguard your system without interfering with legitimate programs.