| dsi.attn_flag | Flags | Unsigned 16-bit integer | Server attention flag |
| dsi.attn_flag.crash | Crash | Boolean | Attention flag, server crash bit |
| dsi.attn_flag.msg | Message | Boolean | Attention flag, server message bit |
| dsi.attn_flag.reconnect | Don't reconnect | Boolean | Attention flag, don't reconnect bit |
| dsi.attn_flag.shutdown | Shutdown | Boolean | Attention flag, server is shutting down |
| dsi.attn_flag.time | Minutes | Unsigned 16-bit integer | Number of minutes |
| dsi.command | Command | Unsigned 8-bit integer | Represents a DSI command. |
| dsi.data_offset | Data offset | Signed 32-bit integer | Data offset |
| dsi.error_code | Error code | Signed 32-bit integer | Error code |
| dsi.flags | Flags | Unsigned 8-bit integer | Indicates request or reply. |
| dsi.length | Length | Unsigned 32-bit integer | Total length of the data that follows the DSI header. |
| dsi.open_len | Length | Unsigned 8-bit integer | Open session option len |
| dsi.open_option | Option | Byte array | Open session options (undecoded) |
| dsi.open_quantum | Quantum | Unsigned 32-bit integer | Server/Attention quantum |
| dsi.open_type | Flags | Unsigned 8-bit integer | Open session option type. |
| dsi.requestid | Request ID | Unsigned 16-bit integer | Keeps track of which request this is. Replies must match a Request. IDs must be generated in sequential order. |
| dsi.reserved | Reserved | Unsigned 32-bit integer | Reserved for future use. Should be set to zero. |
| dsi.server_addr.len | Length | Unsigned 8-bit integer | Address length. |
| dsi.server_addr.type | Type | Unsigned 8-bit integer | Address type. |
| dsi.server_addr.value | Value | Byte array | Address value |
| dsi.server_directory | Directory service | String | Server directory service |
| dsi.server_flag | Flag | Unsigned 16-bit integer | Server capabilities flag |
| dsi.server_flag.copyfile | Support copyfile | Boolean | Server support copyfile |
| dsi.server_flag.directory | Support directory services | Boolean | Server support directory services |
| dsi.server_flag.fast_copy | Support fast copy | Boolean | Server support fast copy |
| dsi.server_flag.no_save_passwd | Don't allow save password | Boolean | Don't allow save password |
| dsi.server_flag.notify | Support server notifications | Boolean | Server support notifications |
| dsi.server_flag.passwd | Support change password | Boolean | Server support change password |
| dsi.server_flag.reconnect | Support server reconnect | Boolean | Server support reconnect |
| dsi.server_flag.srv_msg | Support server message | Boolean | Support server message |
| dsi.server_flag.srv_sig | Support server signature | Boolean | Support server signature |
| dsi.server_flag.tcpip | Support TCP/IP | Boolean | Server support TCP/IP |
| dsi.server_icon | Icon bitmap | Byte array | Server icon bitmap |
| dsi.server_name | Server name | String | Server name |
| dsi.server_signature | Server signature | Byte array | Server signature |
| dsi.server_type | Server type | String | Server type |
| dsi.server_uams | UAM | String | UAM |
| dsi.server_vers | AFP version | String | AFP version |