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How to access different segment using subnet mask

I had to use a Daytek gateway in a rather basic way due to not being able to make changes to the Comcast modem the office uses.  So I am on the 192.168.0.xxx segment.  Due to changes other made to their side of the network, I now need to remote desktop to 192.168.2.1.

I believe I can do this using the subnet mask, but am not quite sure how to accomplish that.  So I am asking for any suggestions.

Thanks in advance.
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jjackson2004
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Is it just as simple as using 255.255.0.0 as the subnet mask for the computer on 192.168.0.xxx?
Im sorry to say but your missing some information from your question in order to get a meaningful answer.

Subnets break up networks to make them more manageable.
When your computer makes a request for anything outside its subnet, the request is forwarded to the gateway or router.
Changing your subnet will most likely cause some issues on your network as the traffic you are sending to the switch and router will not be correctly interpreted.

What are you using to remote into this other computer?
Where are you (same facility? another office? home?) in relation to this other computer?
Office.  I do the accounting networking in back and have tried to keep it separate from the front office network.  Our net used to be isolated, but now we have to have internet access for the new accounting packages.  So with EE's advice, I bought the Draytek gateway and installed it.  But as I am not allowed to change the front office Comcast modem (to set it to bridge mode), I just used the gateway to keep our network on a different subnet.

The front office network was a wired/wireless mixture, but also had a third segment that was used for the remote access (through an old win 2003 terminal server) to a windows server.  Over the last two weeks, the front office had one of their computer guys come in to try to fix some remote issues.  They would up getting off of the terminal server and just making it one network (subnet).  So the one person on that network who accesses the server can get on just fine (but now using an ADP file, not remote desktop as before), but the two people on my subnet and also a user in another state cannot access it.  Their guy wanted me to put my people on their network, but I want to keep the accounting area separate.  

So I assume we would still want to use remote desktop to access their server, or I guess we could use an ADP file, though I think I would prefer the remote desktop.

Does this give you the information you need?
Sort of.
I am not familiar with the gateway in question, but they all work essentially the same way.
Can you ping the server you are trying to remote into?
More importantly, can you traceroute to it?
Can you post the results?
Can you post results of a traceroute to your gateway?  to google?

The issue here seems to be that your computer does nto know how to find the 192.168.2.X network.
The subnet for that network is most likely 255.255.255.0
While the 255.255.0.0 subnet would include both your address and the other server, it will not do what you want.
You need to make sure your gateway can see that other network, not just the internet.  
You then need to make sure your gateway is not blocking traffic between you and the server.
I can ping it.  And when I access it through a browser I see MS IIS.
I am trying to map a drive to the server, but having issues with logging in.  Turns out they turned the server into a domain controller.  and the computers I am using are not in the domain, but the username and password are.  I put the server name and path in the hosts file (it is an XP computer), though I guess I should try the windows 7 computer.
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Ok, I can connect and we set up the Access project, but we keep getting a runtime error.  

This had all been run off the server before using remote desktop, but they had issues so they moved the Access databases to the local computers and access the Sql Server on the server now.  But as they are frugal, instead of using full blown Access on this computer, we are using the Access 2010 runtime.  Are you aware of any problem this would cause in this configuration?
never tried it, no clue. need another person to chime in.
My uneducated guess.... you need to properly install access, not copy a few files.