This .NET class wraps the AcDbHostApplicationServices ObjectARX class. 

The HostApplicationServices class provides various services to host applications at runtime. These services are defined by the RealDWG client. 

A RealDWG host application must provide a class derived from HostApplicationServices. A default service is not provided. 

The controller and transaction methods of this class specify the undo controller and transaction manager that your application will use. You are not required to override or call these methods. The Internet methods allow your application to use URLs (Uniform Resource Locators) directly in your code or through a browser. The methods in the system functions group should generally not be overridden in your host application services class. These methods are set during construction of HostApplicationServices and do not need to be changed.

Autodesk.AutoCAD.DatabaseServices.HostApplicationServices

Public abstract Class HostApplicationServices
Inherits RXObject

public abstract class HostApplicationServices : RXObject;