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ISUSER

InstallShield 2015 » InstallScript Language Reference

During setup initialization, the installation decompresses _isuser.dll, if present, from your setup and copies it to the temporary folder SUPPORTDIR on the target system, giving the file a unique name so that it does not interfere with other InstallShield installations. The fully qualified name of this file, which contains user-defined setup resources, is assigned to the system variable ISUSER.