Assalamu alikum  ,

How to access windows system remotely in local area network

1.go start run and write the ip address like below
   mstsc
2.After click ok
3.give the user name and password
4.you can do anything like yor  normal PC.

but one disadvantage client side  system will be log-off  mode

If you don't want logoff client system and he disappear then go this steps

1.first download one software Ultravnc in clinet side  through this link
     http://www.uvnc.com/downloads/ultravnc.html
2.after download you can install like double click 
3.next do same next and choice where you want to install
4. ok after it take 2 minute 
5.after finished installing you can closed the ultra vnc application 
6.go to right side in  menu bar click show hidden icon 
7.choice the Ultra vnc icon and right click and select properties
8.set the password and click ok then closed the 
9.go to the another system same steps 1to 5
10.after installing on you desktop two icon will apper server and viewer
11.open the viewer and give the ip address of client like
       192.168.1.2
12.click ok and enter the password then ok 
13.after that client pc will be open  
14.you can do anything but client side it will disappear
15.finished  .