I now have sorted my problem,
I followed the internet & networking tutorial at 'HomeNetHelp'.com, including the instructions to install netBUIE. I could share files & printer but I still could not get on the internet from the client.
Trying to access my IP configuration setting & ping the client I also found that my XP host would not allow me to carry out any commands under dos.
I posted this problem on the 'computeractive' web forum & got the following reply.
"Take a look at your Environment Variables by Right clicking on My Computer and selecting Properties.
Select the Advanced Tab then select the Environment Variables button.
Highlight the Path Statement and select Edit. Make sure this line is present in the statement "%SystemRoot%;%SystemRoot%\system32;" if not add to the existing path. omiting the quotation marks."
This rang a bell as the NetBUIE install instructions on the HNH site involved "system root%" ect.
I found this line was indeed missing & added it to the end of the path line.
Restart computers, reset networking to auto assigning of IP addresses, reran the Network Wizard on the host( turn off windows fire wall after this).
Result!! shared internet, with a USB modem. I have to configure my Zone Alarm firewalls not to block
internet contacts from my network. Other than that we are both on the net.
Thanks to all on this steep learning curve,