Command:CVR
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CVR
This command is used to send information about the client and it's operating system to the server. For the official client, the server then responds with the recommended version of the client to use, the minimum safe version as well as 2 URLs, one a link to the download page for the updated version and one to a page with information about the updated version. If the client is unrecognised by the server, the recommended version is 1.0.0000 and the minimum version is the version number sent by the client in the initial CVR.
Sent to server
Description
CVR trid locale_id os_type os_ver arch clientname clientver MSMSGS passport
Parameters
- trid: Transaction ID
- locale_id: Hexadecimal Locale ID - eg "0x0409" for US English
- os_type: Type of operating system - eg "win", "winnt"
- os_ver: Version of operating system - eg "4.10" for Windows 98
- arch: System architecture - eg "i386"
- clientname: Name of your client - eg "MSMSGR" for the official MSN Messenger client
- clientver: Version of your client - eg "6.0.0602"
- MSMSGS: Unknown, official client always sends "MSMSGS"
- passport: Your passport address
Server returns
Description
CVR trid rec_ver rec_ver2 min_ver dl_url info_url
Parameters
- trid: Transaction ID
- rec_ver: Recommended client version, "1.0.0000" for unrecognised clients
- rec_ver2: Always identical to rec_ver
- min_ver: Minimum safe version, current version for unrecognised clients
- dl_url: URL to latest version of client
- info_url: URL with information about client
Other notes
Like with any other command, the server will reply to a CVR command with a CVR reply. For some reason, though, the official client would be just as happy if you replaced CVR with CVQ in the reply.

