Search notes:

Registry: HKEY_CURRENT_USER

HKEY_CURRENT_USER (HKCU) manages settings for the currently logged-in user.
Technically, HKCU is a symbolic link to the subkey HKEY_USERS\{SID} where {SID} is the User's account SID (and starts with S-1-5-21-…).
On Windows NT systems, the settings for each user are stored in the files %USERPROFILE%\NTUSER.DAT and USRCLASS.DAT.
Apparently, processes running under the SYSTEM account (such as SearchFilterHost.exe) cannot access HKEY_CURRENT_USER for logged on users.

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Windows/...', 1758204533, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Windows/registry/tree/HKEY_CURRENT_USER/index(40): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78