This configuration variable applies only to the thin client automatic update feature. The thin client uses the value of the TC_INSTALLER_ARGS configuration variable as the command-line options passed to the installer executable. For example, if you want msiexec.exe to log all of its operations to a file named msi.log, you could set TC_INSTALLER_ARGS to "/log msi.log". TC_INSTALLER_ARGS has no default value.
See Accepting the Automatic Update for more information about this variable.