msnp-wiki/docs/commands/ack.md
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# Introduction
`ACK` is a command introduced with [MSNP2](../versions/msnp2.md).
It is a Switchboard Server command, without a response payload.
Used as a positive response to [MSG](msg.md) A, and later [MSG](msg.md) D commands.
# Client/Request
This command can not be sent from the client.
# Server/Response
`ACK TrID`
# Examples
## As a response to MSG A
```
C: MSG 1 A 69
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
message
S: ACK 1
```
## As a response to MSG D
*Since [MSNP9](../versions/msnp9.md).*
```
C: MSG 2 D 73
MIME-Version: 1.0
Content-Type: application/octet-stream
data message
S: ACK 2
```
## Invalid context
*Inherited from being an unimplemented command.*
```
C: ACK 3
```
Server disconnects client.
# Known changes
* [MSNP9](../versions/msnp9.md): Now happens as a response to MSG D.