1 HELP
  Provides online help for the System Dump Analyzer USB extension.
  This extension allows you to format USB specific data structures
  and tracing information.  The extension does not work with 64 bit
  or any of the address expressions supported by SDA.

  Format

     USB HELP [command-name]

2 Parameter

command-name

  The name of a USB SDA  command. When you enter the HELP command
  with a command name, a list of all the command keywords used with
  the command is displayed.