GIF images which can then be printed as cards on the recipient's local inkjet or laser printer, or displayed on the computer monitor. Many logging programs now have direct electronic interfaces to transmit QSO details in real-time into the eQSL.cc database. CQ Amateur Radio magazine began accepting electronic QSLs from eQSL.cc for its four award programs in January 2009. 10-10 has been accepting eQSLs since 2002. Another system, the ARRL’s Logbook of The World (LoTW), allows confirmations to be submitted electronically for that organization’s DX Century Club and Worked All States awards. Confirmations are in the form of database records, electronically signed with the private key of the sender. This system simply matches database records but does not allow creation of pictorial QSL cards. Despite the advantages of electronic QSLs, physical QSL cards are often historical or sentimental keepsakes of a memorable location heard or worked, or of a pleasant contact with a new radio friend, and serious ham radio operators may have thousands of them. Some cards are plain, while others are multicolored and may be oversized or double paged. Usage in shortwave listening International shortwave broadcasters have traditionally issued QSL cards to listeners to verify reception of programming, and also as a means of judging the size of their audiences, effective reception distances, and technical performance of their transmitters. QSL cards can also serve as publicity tools for the shortwave broadcaster, and sometimes the cards will include cultural information about the country. The High Frequency Active Auroral Research Program has occasionally requested reception information on its shortwave experiments, in return for which it sent back QSL cards. Standard frequency and time stations, such as WWV, will also send QSL cards in response to listeners reports. Other shortwave utility stations, such as marine and aviation weather broadcasters, may QSL, as do some pirate radio stations, usually through mail drop boxes. Usage in CB radio CB radio enthusiasts often exchanged colorful QSL cards, especially during the height of CB's popularity in the 1970s. CB radio operators who met while on the air would typically swap personalized QSL cards which featured their names ("handles") and CB callsigns. Originally, CB required a purchased license and the use of a callsign; however, when the CB craze was at its peak many people ignored this requirement and invented their own "handles". A simple card format might only include the users callsign and/or "handle", home