Is a constant connection of the cash register with CRK (Central Repository of Cash Registers) required? If the cash register communicates with CRK via Ethernet or WiFi, is it possible to use the same connection to communicate with the cash register from the computer (sales system)? What does the registration and settlement of advance payments look like in online cash registers? What schedule of connections with CRK is set in the cash registers? Who is entitled to the deduction for the purchase of a cash register?