webservices and communication

I have 2 windows systems on my network.
System-1 has images to serve and system-2 should display the
images.

On power-on of system-2, it will call the webservice on system-1
and gets an image and displays it.
So far so good, and this I managed to implement easily.

However now I want to be able to change the image on System-2, using a
GUI interface from system-1.
Idea is that system-1 should inform system-2 that it should change its image!
How can I accomplish this?

Should I also run a webservice on system-2 to accomplish this?
Is there any better way to think about this problem.
Probably using windows services?

I am new to windows programming, and not sure what is the best possible approach to
accomplish this. Can someone enlighten me? Thank you.

Re: webservices and communication

Based on my understanding, you can create a webservice on system 2 and if the image on the system 1 was being changed, then you can call that webservice to inform System 2. or you could use WCF dual binding (e.g: WSDualHttpBinding) which allows service to communicate with client.

Re: webservices and communication

Thank you Peter for introducing me to WCF. I will look into this now. Running a webservice on system 2 is not a solution for me.

In the meanwhile I thought the "windows task scheduler" as a solution. Is this a good solution too?

The client will then periodically poll the webserver for new information. Please do let me know your opinion on this.

Re: webservices and communication

You want to call web service on system 1 in the windows task schedule and then schedule this task to run at periodical time, this approach could also complete above goal.

Re: webservices and communication

Thanks a lot Peter. Now I will see what best suits for the needs, WCF or Task scheduler and act accordingly.