The Setup program accepts optional command line parameters. These can be useful to system administrators, and to other programs calling the Setup program.

/SP
Disables the This will install... Do you wish to continue? prompt at the beginning of Setup.
 

/SILENT, /VERYSILENT
Instructs Setup to be silent or very silent. When Setup is silent the wizard and the background window are not displayed but the installation progress window is. When a setup is very silent this installation progress window is not displayed. Everything else is normal so for example error messages during installation are displayed and the startup prompt is (if you haven't disabled it with the '/SP-' command line option explained above)  If a restart is necessary and the '/NORESTART' command isn't used (see below) and Setup is silent, it will display a Reboot now? message box. If it's very silent it will reboot without asking.

/SUPPRESSMSGBOXES Instructs Setup to suppress message boxes. Only has an effect when combined with '/SILENT' and '/VERYSILENT'.
The default response in situations where there's a choice is: -Yes in a 'Keep newer file?' situation. -No in a 'File exists, confirm overwrite.' situation. -Abort in Abort/Retry situations. -Cancel in Retry/Cancel situations. -Yes (=continue) in a DiskSpaceWarning/DirExists/DirDoesntExist/NoUninstallWarning/ExitSetupMessage/ConfirmUninstall
situation. -Yes (=restart) in a FinishedRestartMessage/UninstalledAndNeedsRestart situation.

5 message boxes are not suppressible: -The About Setup message box. -The Exit Setup? message box. -The FileNotInDir2 message box displayed when Setup requires a new disk to be inserted and the disk was not found. -Any (error) message box displayed before Setup (or Uninstall) could read the command line parameters. -Any message box displayed by [Code] support function MsgBox.

/LOG
Causes Setup to create a log file in the user's TEMP directory detailing file installation and [Run] actions taken during the installation process. This can be a helpful debugging aid. For example, if you suspect a file isn't being replaced when you believe it should be (or vice versa), the log file will tell you if the file was really skipped, and why. The log file is created with a unique name based on the current date. (It will not overwrite or append to existing files.)
The information contained in the log file is technical in nature and therefore not intended to be understandable by end users. Nor is it designed to be machine-parseable; the format of the file is subject to change without notice.

/LOG="filename" Same as /LOG, except it allows you to specify a fixed path/filename to use for the log file. If a file with the specified name already exists it will be overwritten. If the file cannot be created, Setup will abort with an error message.

/NOCANCEL
Prevents the user from cancelling during the installation process, by disabling the Cancel button and ignoring clicks on the close button. Useful along with '/SILENT' or '/VERYSILENT'.

/NORESTART
Instructs Setup not to reboot even if it's necessary.

/RESTARTEXITCODE=exit code
Specifies the custom exit code that Setup is to return when a restart is needed. Useful along with '/NORESTART'. Also see Setup Exit Codes.

/DIR="x:\dirname"
 Overrides the default directory name displayed on the Select Destination Location wizard page. A fully qualified pathname must be specified.
 

/GROUP="folder name"
Overrides the default folder name displayed on the Select Start Menu Folder wizard page.

/NOICONS
 Instructs Setup to initially check the Don't create any icons check box on the Select Start Menu Folder wizard page.