InstallShield 2012 » InstallScript Language Reference
This information applies to the following project types:
The REMOVEONLY system variable is set equal to a non-zero value if Setup.exe is run with the -removeonly option, and is set equal to FALSE otherwise. The default code for the OnMaintUIBefore event handler function conditionally displays the SdWelcomeMaint dialog, depending on the value of REMOVEONLY.
This system variable is read-only; if you attempt to assign a value to it, a compiler error results.
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