# Messages Editor: Message Fields
**Table 1** lists all available fields in the Messages Editor. The [Network](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-pick-a-network) selection determines which of these fields are displayed at any given time. For more detail, please click on each field title.
**Table 1: Available Message Fields in Messages Editor**
| Field | Network | Short Description |
| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| [Key](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-key) | Any | Unique number assigned by Vehicle Spy to the message. This field is read only. |
| [Description](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-description) | Any | Text description of the message. |
| [Type](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-type) | CAN or LIN | CAN - Specifies the Arb ID as Standard 11 bit or Extended 29 bit.
LIN - Specifies the message as Master, Slave, or Break Only.
|
| [Arb ID](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-arbitration-id) | CAN | Arbitration ID for CAN messages. |
| [PT, Trgt, Src](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-pt-trgt-and-src) | J1850 VPW 3 byte hdr
ISO9141 / Keyword
J1850 PWM
| Priority/Type, Target, & Source bytes for some types of networks. |
| ID | J1850 VPW 1 byte hdr
LIN
CGI
| The one byte message ID for some types of networks. |
| [Multi](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/multiframe-message) | CAN | Determines if the CAN message is multi-frame and follows the ISO15765-2 or J1939 specifications. |
| Checksum | LIN | Selects the Classic or Enhanced checksum type for LIN messages. |
| [DLC / Len](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-length) | CAN or LIN | Expected length of the CAN or LIN message in bytes. |
| [Data Bytes B1 - B?](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-data-bytes) | Any | Data bytes of the message. Number of data bytes depends upon the network. |
| [Src Node](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-source-node) | Any | Source Node (or ECU) assigned to the message. |
| [Tx Message](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/receive-message-tx-msg-field) | Any | Allows you to associate a receive message to a transmit message for auto response, transmit on change, or signal linking. |
| [Color](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-color) | Any | Determines the color of the message in the Messages view. |