Step 1:Click Star menu
Step 3:Write “getmac” in command prompt
Step 1:Click Start menu
Step 2:Click control panel
Step 3:Click network and sharing center
Step 4:Click change adopter settings
Step 5:Right click on Local area connection and select properties
Step 6:Click Internet protocol version 4(TCP/IPv4) and then click properties
Step 7:Enter IP address
Step 8:Click OK button .
Go to Start click Control Panel if view by large icon then click Network and Sharing Center if view is Category in (network and internet) click (view network status and tasks).Then Click Change adopter settings and right Click on Local area network and click properties
Click Network address Click value and Enter MAC address suppose we Enter 000000CC0000 (12 character mac address) Click ok.
Go to Start run CMD write IPCONFIG /ALL
Type router ip into a browser open the router configer page.login you wireless router page
add mac address status enabled privilege allow and save.
click wireless setting enter password in PSK passphrase and save.
with out adding MAC address net is not working.your network will secure .
1.disconnect computer network cable from modem.
2.connect the computer network cable from router any port but not in wan port power on the router.
3.In browser write 192.168.1.1 after that login window will appear router back side user name and password will mansion.
4.after login click Network and change IP address 192.168.2.1 and click save .
5.connect your computer network cable to modem and create connection between modem and router wan port.
Right Click on my computer Select properties than click change setting select remote
Click Select users
Add User
press OK
start menu search Cmd than write ipconfig 
log off your computer. second computer in start menu search remote desktop connection write the ip of first computer and connect .write user name and password and enjoy.
you need minimum two computer and one cable .you can use cross cable or straight cable both are working .computers connected by cable using network card.its not necessary both computer workgroup are same.
after that We need to set ip address.
For window7
Control panel Select Network and Sharing Center than select Change adopter setting right Click on local area connection select (TCP/IPv4) click properties
set the ip:
ip address : 192.168.1.2
Subnet mark: 255.255.255.0
default gateway: Blank
preferred DNS Server : Blank
Alternate DNS Server : Blank
On the second computer Make the IP Address 192.168.1.3
Everything else the same.
For windows xp
In Control Panel, Open Network Settings.
Right click on Local Area Connections and select properties and set ip.