|Repackaging an INNO SETUP Based Installer|
Some Information from the Change History, for 2.0.0-beta (2001-01-24):
Setup now supports a /SILENT command line parameter. When it is specified, Setup will not ask the user any questions. The startup prompt, any critical error messages and the installation progress window will still be shown on the screen. The startup prompt can be disabled using the existing DisableStartupPrompt [Setup] directive. The install progress window can be hidden by specifying /VERYSILENT instead of /SILENT. Other new command line parameters related to /SILENT and /VERYSILENT: /NORESTART, /LOADINF=, /SAVEINF=, /NOICONS, /COMPONENTS=. New [Run] section flags related to /SILENT: skipifsilent, skipifnotsilent.
Apparently the available Inno Setup switches are documented in the installed "isetup.hlp" file (download their tool).
Not sure about silent uninstall.