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    <p>AppDomains best visualized as a very light weight process. </p> <p>There can be N AppDomains per .Net Process but generally speaking there is only one. The real advantage of AppDomains is they provide an isolation boundary within your process. Objects can only talk to each other across an AppDomain boundary via remoting or serialization. </p> <p>It's also possible to run 2 AppDomains at completely different security levels within a process. This can allow you to run your main application at Full Trust while running Untrusted Plugins at a much lower trust level. </p> <p>It's hard to blanket say yes or no to whether or not a thread respects an AppDomain. It's possible for a single thread to be in N different AppDomains. Such a situation is possible if an object in one AppDomain makes a remote call to an object in another AppDomain. The thread will have to transition between the AppDomains in order to complete.</p> <p>The disadvantage of AppDomains is mainly complexity. Remoting can take a little bit of time to get your head around and properly setting up an AppDomain can be a non-trivial process. </p> <p>You may want to take a peek through the MSDN documentation on AppDomains. It's hard to find a succint tutorial that describes them because they have a variety of complex features. This provides a nice overview which if it doesn't answer your question directly will at least point you in the right place.</p> <p><a href="http://msdn.microsoft.com/en-us/library/cxk374d9.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/cxk374d9.aspx</a></p> <p>This document is no longer maintained please refer to this for the updated version: <a href="https://msdn.microsoft.com/en-us/library/2bh4z9hs(v=vs.110).aspx" rel="noreferrer">https://msdn.microsoft.com/en-us/library/2bh4z9hs(v=vs.110).aspx</a></p>
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    1. COMain concern is that I don't understand the capabilties I'm getting by using them. I read that they are a lightweight process but they seem that the carry more than just that and I may be missing something that could bite me later on. IE I'm taking out more than I need.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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