Made this little program when i was bored...
It's all written in C++ using Visual ++ 2005 Express.

You can send two types of commands.
a) RCON - Rcon commands and dvars. (xff\xff\xff\xff rcon password command)

Host.SendCommand( RCON, "say ^2This message was sent to the server via ^3simple rcon tool ^7:)" );

b) OTHER - Get info commands. (xff\xff\xff\xff command )

Host.SendCommand( OTHER, "getinfo BXi" );

Additionaly you can grab message from server using
ReceiveMessage() function.

// option 1:
char *msgBuff = Host.ReceiveMessage( false );
// option 2:
Host.ReceiveMessage( true );

Files in RAR:

EXE is virus-free but i suggest you scanning it again :P

DOWNLOAD SOURCE CODE

I have uploaded it for everybody to learn some cool stuff and you can do whatever you want with this but you cannot forget to credit me.

@off:
Someone please stick this thread so it won't be lost.