<p>What are the things that Medium Trust stops you from doing?  For example, I've already learned that Medium Trust stops you from using System.IO.Path.GetTempPath().   What other things like that?</p>

Who can be sure? That's why you should develop with a trust level of medium set in your web.config.
```
```
<trust level="Full|High|Medium|Low|Minimal" />
```
```