What protocol does network neighborhood use when copying files ?

What protocol does 'windows  explorer' / 'network neighborhood' use when copying files ?

I am asking this because I have been using TCP/IP to copy files across un-shared machines for several years thru my Delphi backup application
The speed has been same as regular windows copy.
Today one of my customer's copy is very slow via my application and a 'ping' shows several drops.
But he is saying that copy via windows is fast !
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bbaoIT ConsultantCommented:
the protocol is Server Message Block (SMB) directly hosted on TCP/IP. technically, file copying is not directly related to SMB, as it's a function of Windows Explorer or COPY command of Command Prompt (shell) operating on files system via SMB.

the following MSKB article gives a good explanation about this.

Direct hosting of SMB over TCP/IP

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