Its the Zürich Commercial Register of Companies. It gives interested parties confirmation that you are who you say you are, and your company or firm is legally registered, and who the directors are, and if you are in liquidation...

http://www.hra.zh.ch/internet/ji/hra/de/home.html

Try doing a company search...

Your potential new clients may check it to see if you are legitimate and when you were established. You may require a printout from the register when signing up for services (phones etc) on behalf of your firm or company.

dave