Client Automation - All Versions.
Definition of external applications are stored in database in table unittype.
So new external applications are visible for all users and all DSM Explorers.
But settings about external applications items which should be hidden/visible are stored in registry key HKEY_CURRENT_USER\Software\ComputerAssociates\Unicenter ITRM\AdminConsole\Assetportal\Quicklaunch
So these settings are only valid for the logged user. Different users on same computers could have different settings show/hide external applications.
In below example, Application "Trace Route" has been deselected, in registry key app1 is set to 0 (= hide) :
app0 is the first element of the list
When the app* is missing in registry key, default value (1 = show) is used