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Dwight BaerFlag for Canada

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How to connect a laptop to a PC

I have a PC with no wireless card, and no wired Internet access in the building.  
I also have a laptop with access to wireless connectivity.
But the app that needs Internet access is on the PC.
How to connect my laptop to the PC in such a way that the PC can see the Internet through the laptop connection.
Thank you so much.
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Andrew Leniart
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Arana (G.P.)

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I'm in a remote community and with no wireless adapter.
My phone is working as a hot spot.  I have internet connectivity on my laptop.  My laptop is connected to a switch, and the PC is connected to the switch.  Please help me configure the IP address on both the laptop and the PC so that the PC can see the Internet through my laptop.
Dwight, that's a significantly different question so it would have been helpful to include those details from the start.

What version of Windows is on the laptop?
What version of Windows is on the desktop?
Have you set the same workgroup on both the laptop and PC?
Do you have *any* networking experience at all?

If your phone is just acting as a hotspot, then your easiest solution is still as I pointed out in my first answer - simply add a wireless adaptor to the PC. You will obtain better performance by simply connecting the PC to your Phone's hotspot via a wireless network adaptor.
My wireless adapter on my laptop (connected to my phone) has an IP address of 172.20.10.6
Default gateway:  172.20.10.1
I'm setting my local area connection to 172.20.10.2
I'm setting the PC to be 172.20.10.3

But the PC isn't able to see my laptop yet at 172.20.10.2
I am A+ certified, yes, and I understand about networks generally.
I'm also CCNA certified, I'm embarrassed to say.  This should be a very straightforward question for a Cisco engineer.  But it's been a while.
I have no wireless adapter for my PC, and no store to buy one.
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My laptop (Windows 7) can see the PC (Windows XP!)  but the PC can't ping the laptop.

I have them both in the same workgroup, same default gateway, same subnet mask.
Progress:  I turned off Windows Firewall on my laptop, temporarily, and allowed remote connections.
Now the PC can ping the laptop.  

It still can't ping google.com
Clarification:  I can ping Google from my laptop, but not from the PC.  Although the PC can ping the laptop, and is in the same subnet and same workgroup.
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On the laptop, network discovery is turned on.  As is file and printer sharing.
The default gateway on the PC is set to the IP address of the laptop.
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no joy yet with the gateway set on the workstation to be the same as that of the pc, i.e. my phone
Progress:  I have remote desktop working from the XP workstation to the  laptop.

But it's the app on the workstation that needs an Internet connection.  

It's a payroll app.  Sortof important to our organization.
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Arana (G.P.)

can you ping 104.20.168.10   (experts exchange) from your desktop, using ip address instead of dns name?
no - I can't see "the cloud" yet.  I can remote desktop to the laptop with Internet access, but I can't make the last step of seeing "the cloud".
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Thanking each of you for your help, hopefully I acknowledged everyone who contributed.  In the end we just picked up the machine and carried it to a different building where we could get Internet.  I still wouldn't mind knowing how to configure Internet Connection Sharing on Windows XP.  But for for now this is being closed.