This namespace contains the classes, enumerations, and interfaces that are used to define the host that is used by the Windows PowerShell runtime to communicate with the user.

 Classes

Class	Description
ChoiceDescription	Defines a choice that can be presented to the user by the Host interface, such as Yes to &All.
FieldDescription	Represents an option that is used in a Windows PowerShell prompt call.
HostException	The exception thrown when the host cannot complete an operation, such as when the host is checking whether there is any input available.
PromptingException	The exception that is thrown when an error occurs while the host displays a prompt for a command parameter.
PSHost	Defines the properties and methods required to create a custom host.
PSHostRawUserInterface	Defines the low-level user functionality, such as read and write, that a host application can implement to support cmdlets that perform character-mode interaction with the user.
PSHostUserInterface	Defines those members used to perform dialog-oriented and line-oriented interaction between the cmdlet and the user, such as writing to, prompting for, and reading from user input.

 Interfaces

Interface	Description
IHostSupportsInteractiveSession	Provides support for opening and closing, entering and exiting, a PSSession on a computer. This class is introduced in Windows PowerShell 2.0.
IHostUISupportsMultipleChoiceSelection	Provides a set of choices that enable the user to choose one or more options. This interface is introduced in Windows PowerShell 2.0.

 Structures

Structure	Description
BufferCell	Represents a buffer cell that has a specific character, foreground color, background color, and cell type.
Coordinates	Defines the X (column) and Y (row) coordinates that are used to describe the corners of a Rectangle object.
KeyInfo	Represents key information such as the character, virtual key code, the state of any associated control keys, and the state of the key (down).
Rectangle	Represents a rectangular region of the screen.
Size	Represents a width and height pair.

 Enumerations

Enumeration	Description
BufferCellType	Defines the type of buffer cells that can be used to display single-cell or double-cell characters. For example, is the cell complete or is a leading or trailing cell for double-cell characters.
ControlKeyStates	Defines the states of specific control keys, such as the ALT key, CTRL key, SCROLL key, and CAPSLOCK key.
ReadKeyOptions	Defines the options used to control the behavior of the ReadKey method.