[xnna92]

It's all in the title pretty much, is there a way for me to remotely access that PC without the person knowing it ? Thanks!

[_Pr0xy]

If you are able to access it physically without the target knowing, you could be able to plug in a USB stick that contains malware of your choice that can give you a backdoor into the system. If you'd rather not code your own backdoor/remote shell, you can use Metasploit or another tool, however if AV is present on the system there is a high chance of it being detected. Therefore I would advise you to create your own tool. You could also use a USB rubber ducky, or a makeshift one (such as using an arduino pro micro) to quickly download/install some software that will give you a backdoor onto the system. A reverse shell would also remove the possibility that the firewall on the targets computer is set up not to let out any connections to foreign addresses.
If you have any questions feel free to PM me :)

[DARPA]

Why everyone gotta always assume the hard shit. Fucking download the script and smuggle it through Dubai airport.....

There is this shit on pc"s called RDP. It's free.

[Mr.Zzz]

Hi xnna92,

if you use Kali Linux, you can try:

BeeLogger