telnet

The easiest way is for you to email your current IP address to the other person, and they can then telnet with the command
telnet

If you plan to do this frequently, setting up a vpn is a reasonable thing to do, but only if you will originate the vpn into their fixed address. VPN gives you security from snooping, but does not solve the IP problem. If they need to originate the vpn, you still have the same IP problem -- they do not know the IP to target.

If your dynamic IP tends to stick around for reasonable periods, you might consider using dyndns.org or a similar service to register a dns name for your machine, which you change when the IP changes. (You do this by logging into their site.) This would simplify both telnet and vpn, since either could target the logical DNS name.

To set up a vpn on NT, you must install the pptp protocol, then configure RAS (or RRAS) to "dial" or receive calls using the vpn adaptor rather than a modem.

The following two URL's will tell you everything you ever wanted to know about setting up a vpn. (remove any spaces or line breaks that this editor may have inserted)

http://www.microsoft.com/technet/treeview/default.asp?url=/TechNet/columns/inside/pptpwp3.asp

http://support.microsoft.com/support/kb/articles/Q154/0/62.asp

Good luck.

In addition to the first answer, make sure you are running a telnet daemon on your server (it listens for the incoming telnet session, does the login and starts a shell). You will also have to create an account for the remote user.

check out http://www.no-ip.com/ to bind a dynamic IP-address to a DNS-name

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