/?    This help screen
/B    Go directly into the Customization Utility
/I     Go directly into the Installer
/U    Run setup in unattended mode (see setup.lst for more details)
/P    Specify dynamic port to customized silent installer
/O    Turn off reboot screen during customized silent or unattended install
/PD=    Specify printer to be default (only used with /U switch)
/PORT=    Specify port while running unattended (only used with /U switch)
/PRINTER=    Specify printer while running unattended (only used with /U switch)

Usage Examples: 
Setup [/B] [/I]
Setup [/U [/PORT=LPT2:] [/PRINTER=2] [/PD=1] [/O]]
Setup [/P=//myshare/myport] [/O]