In a simple way every pc or laptop does has an IP address and there is proper way to assign an IP adress that more than one pc or laptop can communicate in each other in same sub net other wise would say no.
Now I explain what is the IP address?
according to IP version 4 IP address nrmally is 32 set and it has been divided into four parts
CLASS A:
IP RANGE : 0-126 -0.0.0
SUBNET MASK: 255.0.0.0

CLASS B:
Ip : 128-191 . 0.0.0
SUBNET MASK:255.255.0.0


CLASS c:
IP:192-223.0.0.0
SUBNET MASK: 255.255.255.0

Now I explain how make an IP through those.
Every Ip has two parts
1- NET ID
2- HOST ID
Now there is rule
TO COMMUNICATE NETID SHOULD BE SAME & HOST ID SHOULD BE DIFFERENT
Now evrery class what is this bit confusing but its simple to understand
NETID, HOSTID
In class A fist eight parts use for net ID
i-e
every class first ip
10.0.0.1
in above those
12 is a net id
and rest is the post id now its important have have a same net id for communication.
now you have 127 networks in class A
2 POWER 24 -2 = 16777214 Post

NOTE: HOST MEANS COMPUTER/ DEVICE ATTACHED WITH NETWORK.
The rest in my next post
PC Laptop Repair