Returns the full host name of the host referenced by some requests (for example, &SOCKET GETHOSTBYNAME).
&ZSOCFHNM is set by the host lookup functions GETHOSTBYNAME and GETHOSTBYADDR.
It is also updated by &SOCKET calls with the name associated with the last referenced sockets.
Example: &ZSOCFHNM
&SOCKET GETHOSTBYADDR ADDRESS=198.4.58.4 &WRITE DATA=HOST &ZSOCFHNM
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