Connecting remote Site

Dear all,
     I have ISA 2004 on my network. and I have a client computer at another 
city and it has an internet connection. what should I do with the ISA 2004 and 
what to install on the client side so I can make a connection over the internet 
that is very secure. like if that client is on my LAN network and very safe to 
access and can join it to the domain on my LAN network. in addition to that I 
want that client to access the internet also at his site. 

Best Regards
End.Hashem Al Safadi

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