CSockets from a beginner

I would like to check if there are other copies of an app (from me) running on other PC's in a network.
I have never used CSockets but I think they could be a way to go.

So.
Can an app on PC1 check if PC2 is running the same app via a CSocket.
Does this require any installed on the server to function.
What happens if for example the server is running novell.
Would firewalls on the PC's block communication.
And finally how rapid would the response be (assuming the app can respond immediately on reception of the query)
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AndyAinscowFreelance programmer / ConsultantAsked:
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Roshan DavisCommented:
Yes, you can use CSocket

>> Would firewalls on the PC's block communication
If the port that you are usiing for the communication is blocked in the firewall, will block the communication.

What about DCOM and RPC?
I'm not familiar in that, guess that also will work

Rosh :)
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
'If the port that you are usiing for the communication is blocked in the firewall, will block the communication'
Oh Dear.  Not what I want but I suspected that could be the case.  Can one detect if a firewall is installed and not letting the connection be made?  At least then I could 'force' the user to modify the firewall settings.
Do you know about the speed?

'What about DCOM and RPC?
I'm not familiar in that'
I also know little about these.

Maybe more explanation,
I want to be able to limit the number of users at any one time using the app.  Licencing eg max 3 concurrent users.
I have thought of keeping a file on the server which will keep details of each user as they login and remove them as they close the app.  I can also think of ways around this strategy so I am investigating other possible ways.
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Roshan DavisCommented:
>> I have thought of keeping a file on the server which will keep details of each user as they login and remove them as they close the app

Yes, You can keep that user info in Server memory itself- in a structure array or something like that.  

>>   At least then I could 'force' the user to modify the firewall settings.
the port for the communication should be a variable, so user can chage the socket port. If any other application is using the same port user can change that thru a settings program.

Rosh :)
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
>>   At least then I could 'force' the user to modify the firewall settings.
the port for the communication should be a variable, so user can chage the socket port. If any other application is using the same port user can change that thru a settings program.


OK. PC1 opens a socket and broadcasts "hello, Ive started"
How do I detect that a lack of response is that no other PC on the network is running my app rather than a firewall has gone STOP.  ALERT.  INTRUDER.  ***** OFF
Absence of evidence is not evidence of absence!
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Roshan DavisCommented:
All the messages are passed thru the Server.

Clients will send messages to the Server, Server have the list of all clients and will send the message to other clients that are in the Server list.

This Server list contain only the successful logged in clients

Rosh :)
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
So does a 'master' program need to be installed and running on the server?

Do you have an example?
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Roshan DavisCommented:
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
I'll have a look later or tomorrow.  No more time now.
Thanks.
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Roshan DavisCommented:
Okay
Rosh :)
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
Hi Roshmon
I've downloaded the netmsg-fxx.  It's rather complex, I'll need a little time to investigate it further and see if it is usefull.
I'll get back asap.
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Roshan DavisCommented:
Okay, All the Best
Rosh :)
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
Hi Rosh,
I'm still not convinced this is really what I require.  It's a possibility but is the most appropriate for my situation.
Having something running on a server really restricts it to windows based server environments.

Thanks for your comments and the link.
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