Please tell me how to install Windows from LAN using a server and how to create server between two laptops/systems.
Honestly setting up a network installation for Windows isn't something you can easily explain in a few lines [in here].
You will have to setup a server with PXE boot, create a Windows PE (Pre-Install environment) etc... last but not least your computers [network cards] actually have to support PXE boot. Otherwise you just wasted your time setting everything up.
Also what do you mean by creating a server between two laptops/systems?
Do you want to setup an actual server or do you want to "connect" both systems like sharing files, printer etc.?
Mike, thanks for compiling the information for such a complex question!