Unofficial Protocol Docs: Channel properties - mono-chat/Mono-Project GitHub Wiki

Using the PROP command against a channel, certain properties could be read and/or written.

CLIENT - Unknown
CREATION - Read only. The date and time that the room was created, stored as a standard UNIX timestamp.
HOSTKEY - Write only. The password used to make one's self a host in the room.
LAG - A number of seconds between 0 and 2 that enforces a minimum delay between two messages from the same person.
LANGUAGE - A number between 1 and 99 indicating the main language spoken in the room (see list below).
MEMBERKEY - Write only. The password used to get into the room (same as MODE +k).
NAME - The room's name (same as the actual room name in practice).
OID - Read only. Unsupported on MSN (always 0, just like the IRCX protocol says).
ONJOIN - A message that is automatically sent to everyone that joins the room.
ONPART - A message that is automatically sent to everyone that leaves the room (fairly useless as far as the MSN Chat Control goes).
OWNERKEY - Write only. The password used to make one's self an owner in the room.
PICS - Stores the PICS rating for the room. For more info on PICS, see http://www.w3.org/PICS/ .
SUBJECT - Read only. Stores information for the Room List generator, for example "1:-ST!EN-US!UL" which means 1:-ST (unknown what this means, but something related to MSN official chatrooms), EN-US location (English, United States), in the UL (Unlisted) Category.
TOPIC - The room's topic (same as /topic %#roomname).

Supported languages:

1. English
2. French
3. German
4. Japanese
5. Swedish
6. Dutch
7. Korean
8. Chinese (Simplified)
9. Portuguese
10. Finnish
11. Danish
12. Russian
13. Italian
14. Norwegian
15. Chinese (Traditional)
16. Spanish
17. Czech
18. Greek
19. Hungarian
20. Polish
21. Slovene
22. Turkish
23. Slovak
24. Portuguese (Brazilian)

Supported categories:

UL - Unlisted
GE - City Chats
PT - Chat Partners
CP - Computing
EA - Entertainment
EV - Events
GN - General
HE - Health
II - Interests
LF - Lifestyles
MU - Music
NW - News
PR - Peers
RL - Religion
RM - Romance
SP - Sports & Recreation
TN - Teens