And precisly how does the mechnaism with gethostbyaddr(),
e.g. an DNS request, work to be able to resolve the issue
about weather a particular host i online or not? 

As far as I know this is not possible. The only thing one might
be able to say after a successfull DNS look up is this-or-that
host has a registered entry in the DNS server. Nothing more can
be deduced.

If I messed something here, please fill me in.

-----Original Message-----
From: J.Veenhuijsen
To: [EMAIL PROTECTED]
Sent: 2003-12-01 12:53
Subject: [PHP-WIN] Re: How to find out if PC is online

Try :

gethostbyaddr (PHP 3, PHP 4 )
Get the Internet host name corresponding to a given IP address
string gethostbyaddr (string ip_address)
Returns the host name of the Internet host specified by ip_address. If 
an error occurs, eturns
ip_address.
See also gethostbyname().

Jochem

Jan Hrebenar wrote:
> Hello All,
> 
> I`d like to make script which will detect
> if my computer at IP xxx.xxx.xxx.xxx is online.
> I try to use system("ping") but this function
> is not allowed on server.
> 
> Can somebody tell me if exist any other way
> to do this?
> 
> Pls excuse my english

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