The most recent device management command data (if any) specified for this conceptual row in the 'xcmHrDevMgmtTable'. Usage: Conforming management agents SHALL 'reject' any SNMP Set-Request to 'xcmHrDevMgmtCommand[Request|Data]' while another management operation is already in progress (ie, while 'xcmHrDevMgmtCommandInProgress' is 'true'), with 'badValue' (SNMPv1) or 'inconsistentValue' (SNMPv2/v3). Usage: Conforming management stations SHALL set 'xcmHrDevMgmtCommandRequest' (mgmt operation) and 'xcmHrDevMgmtCommandData' (mgmt arguments) SIMULTANEOUSLY (in the same SNMP Set-Request PDU). Usage: Conformant implementations MUST encrypt passwords, keys, and other security information stored in this string object.