| Bit | Name | Signification |
| 0 | A_SETSTATUS | client supports the VA_SETSTATUS message |
| 1 | A_START | client supports the VA_START message |
| 2 | A_STARTED | client supports the AV_STARTED message |
| 3 | A_FONTCHANGED | client supports the VA_FONTCHANGED message |
| 4 | A_QUOTE | filename are quoted if needed |
| 5 | A_PATH_UPDATE | client supports the VA_PATH_UPDATE message |
| Bit | Name | Word | Signification |
| 0 | V_SENDKEY | 0 | AV_SENDKEY message supported |
| 1 | V_ASKFILEFONT | 0 | AV_ASKFILEFONT message supported |
| 2 | V_ASKCONFONT | 0 | AV_ASKCONFONT message supported |
| 3 | V_ASKOBJECT | 0 | AV_ASKOBJECT message supported |
| 4 | V_OPENWIND | 0 | etc ... |
| 5 | V_STARTPROG | 0 | |
| 6 | V_ACCWINDOPEN | 0 | |
| 7 | V_STATUS | 0 | |
| 8 | V_COPY_DRAGGED | 0 | |
| 9 | V_PATH_UPDATE | 0 | |
| 10 | V_EXIT | 0 | |
| 11 | V_XWIND | 0 | |
| 12 | V_FONTCHANGED | 0 | |
| 13 | V_STARTED | 0 | |
| 14 | V_QUOTE | 0 | quoted filename supported |
| 15 | V_FILEINFO | 0 | |
| 0 | V_COPYFILE | 1 | |
| 1 | V_DELFILE | 1 | |
| 2 | V_VIEW | 1 | |
| 3 | V_SETWINDPOS | 1 |
For more information, see the hyptexte documentation of Thing about the AV protocol.