1. App Web & Host Web
The special website to which the app is deployed is called an App Web.
The website to which the app is installed is called the Host Web.
例子：
ClientContext context = new ClientContext("https://gjq.sharepoint.com/");
System.Security.SecureString passWord = new System.Security.SecureString();
foreach (char c in "abcd1234%".ToCharArray())
{
passWord.AppendChar(c);
}
context.Credentials = new SharePointOnlineCredentials("cn0jacky@gjq.onmicrosoft.com", passWord);
3. App中的Client Web Part是否加入到Feature或者package中不影响App中的内容，App文件会将项目中的所有信息加入进去；
4.
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原文：http://www.cnblogs.com/qijiage/p/3907556.html