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| 16 bits | request opcode |
| 8 bits | request flags (0=nothing, 1=require confirm) |
| 8 bits | & argument count (unused) |
At the moment, the request flags field is used only to indicate whether the Lisp client desires a confirmation message when the request is finished processing. If the request returns any values, this counts as the confirmation. Otherwise, an empty confirmation message will be sent.
| 32 bits | response tag |
| rest | return data (if any) |
The response tag can have the following values:@[2mm]
| Tag | Meaning |
|---|---|
| CONFIRM_REPLY | confirmation (for synchronization) |
| VALUES_REPLY | return values from a request |
| CALLBACK_REPLY | a widget callback has been invoked |
| EVENT_REPLY | an X event handler has been invoked |
| ERROR_REPLY | an error has occurred |
| WARNING_REPLY | a non-fatal problem has occurred |
| PROTOCOL_REPLY | a protocol callback has been invoked |