FTP replies

How to get the FTP replies?

I know that I can get it using the "LastCmdResult" ? But I am still
confuse with how to use it.

For example, after the login process, I want to get all the "230"
numeric replies to get the account information (quota, for example).
Certain FTP server use 230 for this purpose.

I am confuse, when to read the "LastCmdResult".

When will it be cleared ?

thanks.