CLX has several possible callbook servers. Your sysop may have one or more of them active. The two commands useable are SHOW/CBA and SHOW/CALLBOOK. The SHOW/CALLBOOK command is used to query a local callbook server, either on the hard disk or a QRZ callbook CDROM. SHOW/CBA is more flexible and can be arranged to query several other types of local CDROM or alternatively a remote callbook server.