I set up my obsolete laptop as a temporary wifi hotspot. If that is what you are asking, then yes.
A person should install a PCIe network adapter in the PCIe network slot on a pc. The PCIE network adapter allows the PC the ability to connect with the Internet.
Yes, the wireless network adapter allows you to connect wireless with any device supporting it. Laptop come with network card and for old PC you have to buy it.
Yes, it is possible to have two ethernet ports on a laptop. While there is no laptop that I am aware of that comes with two, you can still add a second device. Ethernet adapters come in both PC Card and USB varieties, so assuming you have a free USB port or PC Card slot you can simply plug one in. In this configuration, you can use the onboard network adapter, and the USB/PC Card adapter at the same time.
ANS16 is an adapter to allow the ATech simulators / trainers to be networked to an instructor's pc or laptop. This adapter will allow 16 trainers to be networked
Network adapter
yes it does
A 2.5 inch laptop hard drive can be used in a desktop computer with an appropriate adapter and mounting. Laptop CD / DVD drives have proprietary connectors. To use them, you would have to partially disassemble the drive, and then connect the aforementioned adapter.
Network Adapter ~Matthew Dodge
Plug out the network cable in the back, or disable the network adapter from the network connections panel.
Fiber
I connect to my Raspberry Pi from my desktop PC and a laptop via SSH (Secure SHell) over a home network.
You buy a wireless router, wire the desktop and router to the modem, and use the laptop by getting a wireless card or usb wireless adapter.