I use RoboForm to store all of my sensitive information, login names, passwords, etc. It keeps this in a special highly encrypted database on my computer that is protected by my special password that I only use for Roboform.
So the technician can see the database but cannot view its contents. RoboForm is also great for automatically filling in those tedious forms if you purchase items over the Internet.
Here's a link to the
Roboform site.