How to make SharePoint display computer status and calendar?

I want to add to my SharePoint site something like a Web Part that will ping a computer and say if this comput开发者_C百科er is online - how can I do this?

Another question is how can I connect two SharePoint calendars: if someone update one of them the other will update too?

Thanks.

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For the second question, you can create a workflow in sharepoint designer to add a new calendar item in the second calendar every time the first calendar has a new item.