Sends a MON_CLIENT_MSG_TYPE_POLL_CALL message to the target client.
This poll returns data about a specific message type in the client in a
MON_CLIENT_MSG_TYPE_POLL_RESULT message.
Note: The traffic statistics presented in the result message
from this poll are truncated to 31 bits, and may contain an incorrect sign
bit on some older servers. This method is provided for compatibility with
pre-6.7 servers. When polling newer servers, you should use
clientMsgTypeExPoll.