public virtual void SendAccountInfo(
	string accountInfo
)

Public Overridable Sub SendAccountInfo ( _
	accountInfo As String _
)

public:
virtual void SendAccountInfo(
	String^ accountInfo
)

This can be used for a variety of purposes - for example, the server could indicate that a password has expired (by sending 332 in reply to PASS) and a new password automatically supplied via ACCT. Or it could be used by proxies to supply a proxy password. It is up to the server (or proxy) how it uses this string.