In a managed environment, like SBC, you typically don’t want that the Citrix Receiver is started for every user. To prevent this behavior you delete the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ConnectionCenter value in registry.
My results with Citrix Receiver 4.2 are a broken Citrix Receiver installation which starts a reinstall of the icawebwrapper msi. The Citrix Receiver is checking the existence of the value ConnectionCenter in te registry. To prevent this from happening you shouldn’t delete the ConnectionCenter value but make it empty!