| PPEKK | Computer Program eKasa Client | Certified software for communication with Financial Administration server and management of fiscal operations |
| CHDU | Protected Data Storage | Non-erasable write-once memory for storing all fiscal operations |
| FS | Financial Administration | Central server of Financial Administration of Slovak Republic for document verification and registration |
| TM5000WIN | VAROS Print Manager | Windows application for communication with FT4000 and CHDU5000 |
| ESC | ESC Sequences | Standard communication protocol (compatible with fiscal devices) |
| UID | Document UID | Unique document identifier on FS server, printed under QR code |
