There is a logfile (i.e. "anysite91US" for As 9.1 US) that indicates if the install is shared or single. On a Win 7-64, the AnySite91US log file is located C:\Users\user login name\AppData\Local\Temp. Open the log file in Notepad and search for MI_SHARED. The line that indicates single install or Shared install is - Property(S): MI_SHARED = shared OR Property(S): MI_SHARED = single.
UPDATED: September 6, 2017