The file rpcsetup.exe includes several different programs: server, client, helpdesk, install, uninstall, exegen. Each program is activated by its specific command line switch:

Access Remote PC Programs
rpcsetup.exe /install <install switches>	Starts installer. If the program is not installed, running rpcsetup.exe without this switch starts installation automatically. If the program is installed, this switch forces installation. You can use it to reinstall or repair your existing installation.
rpcsetup.exe /uninstall <uninstall switches>	Starts uninstaller.
rpcsetup.exe /server <server switches>	Starts the server.
rpcsetup.exe /client <client switches> <optional path to .rpc file>	Starts the client. You can optionally specify a path to Remote PC Shortcut file (.rpc) to automatically connect and login to a remote system.
rpcsetup.exe /helpdesk <helpdesk switches>	Starts helpdesk-mode server
rpcsetup.exe /exegen <exegen switches>	Starts exegen utility.

Note: a switch must begin with / or -. Some switches can be followed by a value. Values containing spaces must be enclosed in quotation marks.

Install Switches:
/silent	When this switch is used, the installer does not show dialogs and message boxes (including error messages). Instead, use command-line switches to control the operation of the program. You can use the /log switch to log all events generated by the setup to a text file.
/log "PATH"	Log all events to the file specified by the PATH. Paths with spaces must be enclosed in quotation marks. If path is omitted, log file will be created in the same directory as rpcsetup.exe with the name <ComputerName-DateTime>.log
/installdir "PATH"	Install to the specified directory. Paths with spaces must be enclosed in quotation marks. Default is "Access Remote PC <Version>" in the Program Files directory. If using this switch, you must specify the entire path.
/dontcopysettings	Do not copy settings from the old version. The switch is useful when upgrading. By default, setting from the old version are preserved. This switch is valid only if used with the /silent switch.
/replaceexe	Replace executable when repairing an installation. By default, the executable file is left intact during reinstallation if it was found.
/programgroup "NAME"	Specifies the name for the Program Group in the Start menu. If this switch is omitted, the name will be "Access Remote PC <Version>"
/noshortcuts	Do not create program group in the Start menu. This switch is valid only if used with the /silent switch. You can also exclude individual shortcuts from the Start menu using the following command-line switches:
/noclientshortcut	Exclude client shortcut from the Start menu. This switch is valid only if used with the /silent switch.
/noservershortcut	Exclude server shortcut from the Start menu. This switch is valid only if used with the /silent switch.
/nouninstallshortcut	Exclude uninstall shortcut from the Start menu. This switch is valid only if used with the /silent switch.
/nodocshortcut	Exclude documentation shortcut from the Start menu. This switch is valid only if used with the /silent switch.
/dtclient	Create a client icon on the Desktop
/dtserver	Create a server icon on the Desktop
/dtserverstandalone	Create a standalone server icon on the Desktop
/qlclient	Create a client icon in the Quick Launch
/qlserver	Create a server icon in the Quick Launch
/qlserverstandalone	Create a standalone server icon in the Quick Launch
/port PORT	Use specified port number for the server.
/hideicon	Do not show the tray icon in the Task bar. This setting is preserved across sessions.
/ntserviceoff	Do not install NT service. By default, the service is installed. Note that NT service can be installed only under account with administrative privileges.
/autostartoff	Do not start server at Windows startup. By default the server is installed with autostart option turned on.
/rpc-number RPC-NUMBER	Set RPC Number to be used to connect to this computer
/rpc-password RPC-PASSWORD	Set the password provided with the RPC Number when you signed up for the service
/regname "NAME"	Specify the registered name for license installation.
/regkey KEY	Specify the registration key for license installation.
/cmdline ("COMMAND-LINE")	Specifies the command line to be embedded into the installed executable. Must be enclosed in double quotes and parantheses as shown here.
See also the switches used to create a user account below.

Uninstall Switches:
/silent	When this switch is used, the uninstaller does not show dialogs and message boxes (including error messages). Instead, use command-line switches to control the operation of the program. You can use the /log switch to log all events generated by the uninstaller to a text file.
/log "PATH"	Log all events to the file specified by the PATH. Paths with spaces must be enclosed in quotation marks. If path is omitted, log file will be created in the same directory as rpcsetup.exe with the name <ComputerName-DateTime>.log

Client Switches:
/fullscreen	Start Remote PC Client in fullscreen mode
/hdmode	Start Remote PC Client in helpdesk mode.
/sessionpassword PASSWORD	Use the specified session password for listening. Usefull when used with the hdmode switch.

Server Switches:
/standalone	Start the server in standalone mode as ordinary application.
/silent	Start the server minimized.
/startservice	Start Access Remote PC service. To restart the service, use both /stopservice and /startservice switches.
/stopservice	Stop Access Remote PC service.
/port PORT	Use specified port number. The setting will be preserved.
/hideicon	Do not show the tray icon in the Task bar. This setting is preserved across sessions. To show the icon again, use the /showicon switch.
/showicon	Show the tray icon in the Task bar. This setting is preserved across sessions.
/autostart	Start server (as the system service) at Windows startup. On Windows NT platforms (NT4.0/2000/XP) this switch is ignored if NT service is not installed and the program is started under account without administrative privileges.
/autostartoff	Do not start server (as the system service) at Windows startup.
/exit	Process command line and exit.
/rpc-number RPC-NUMBER	Set RPC Number to be used to connect to this computer
/rpc-key RPC-PASSWORD	Set the password provided with the RPC Number when you signed up for the service
See also the switches used to create a user account below.

Helpdesk Switches:
/accesscode ACCESS-CODE	Use the specified access code. When access code is specified on the command line, the access code box is not shown.

Exegen Switches:
/cmdline ("COMMAND-LINE")	Specifies the command line to be embedded into the generated executable. Must be enclosed in double quotes and parantheses as shown here.
/saveas "PATH"	Specifies the full path where the generated executable should be saved to. Valid only if specified with the silent switch.
/overwrite	Overwrite the original command line in the source executable. The default is merge. Valid only if specified with the silent switch.
/silent	Do not show dialogs. Must be specified with the /cmdline and /saveas switches.

The following switches can be used to create a user account from the command-line. The order of the switches is not important. These switches can be used only with /install and /server switches.
/user USERNAME	Mandatory
/pass PASSWORD	Mandatory
/userdir "DIRECTORY"	Optional. Defaults to "unrestricted".
/perm PERMISSIONS	Optional. Defaults to 255 ("all permissions"). Permissions is a number that can be calculated by adding the numbers corresponding to individual permissions: View screen 1 Control keyboard and mouse 2 Upload files 4 Download files 8 Delete files 16 Browse files 32 Allow connections to unattended sessions 64 Allow sound transfer 128 Do not display a connection notification 256 Automatically remove desktop wallpaper 512 All permissions 1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 + 256 + 512 = 1023
/timeout NUMBER	Inactivity timeout in seconds. The default is 0 (no timeout).
/ntauth	Use NT integrated authentication for the created account.
/ntgroup	When used with /ntauth, specifies that the username is NT security group name.