How to Access a Remote Computer?

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Is there anyway I can access a remote computer? What things do I need?

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If you don’t have a router, you have to configure your security settings like windows firewall. For remote software installment, check these links for your preference.
RealVNC - RealVNC remote control software
TightVNC: VNC-Based Free Remote Control Solution
UltraVNC: Remote Support Software, Remote Support tool, Remote Desktop Control, Remote Access Software, PC Remote Control
You may also check this, What Is My IP Address? - IP Address Lookup, Info, Speed Test, and more for your ip address. Then, just connect to it. Just view the application with your preferred remote software you just installed.