What is Loose XAML
Loose XAML are .xaml files without code behind them that can be run within the browser without compilation.
What is partial trust
There are some restrictions on it. browser based applications are partial trust.
What is sand box
A partial trust application make what ever API calls or external calls it will go through a filter.
WPF browser based applications runs on which OS
Only windows
Silverlight based applications runs on which OS
Windows, mac. it is cross plate form
Does click one application cache
Yes