Usage: WDSMCAST is a command line utility that you can use to connect a client computer to a namespace or multicast transmission ...

Usage:
    WDSMCAST is a command line utility that you can use to connect a client
    computer to a namespace or multicast transmission on a Windows 
    Deployment Services server. You can use this utility with the Windows 
    Deployment Services content provider, or with a custom content provider.

Syntax:
WDSMCAST.exe /Transfer-File /Server: /Namespace:
             [/Username:] [/Password:]
             /SourceFile: /DestinationFile: 
             [/Buffer:] [/UseSparseFile:]

WDSMCAST.exe /Get-Images /Server:
             [/Username:] [/Password:]

WDSMCAST.exe /Apply-Image /Server: /Namespace:
             [/Username:] [/Password:]
             /SourceFile: [/Index:]
             /DestinationPath: [/Buffer:]

WDSMCAST.exe /Apply-CustomImage /Server: /Namespace:
             [/Username:] [/Password:]
             /SourceFile: [/Index:]
             /DirectPath: /DestinationPath:
             [/ReferenceWimSourceFile:]
             [/ReferenceWimDirectPath:] [/Buffer:]


Commands:
/Transfer-File                    Used to transfer any file using a WDS
                                  multicast server to a specified
                                  destination file.  Custom namespaces 
                                  and multicast content providers are 
                                  supported.