Your stock OSes don't have a telnet server so there is nothing for telnet to connect to.
You claim that the PC has a telnet server but how did you configure said server to be reachable via the internet? I don't see where you put this PC in to the DMZ or tried your hand at port forwarding on the router.
Is it possible to access a computer from another computer with using telnet and that both computers are connected to internet using 2 usb dongles??
my purpose is remotly access one computer which has hardware(a home automation embedded device) that connect with serial port. that computer also has telnet server which respond to that hardware..
I used other computer's windows telnet client to acces..
I tried access using first computr's(hardware connected) private IP(ipconfig shown) and public IP(get from googled "show my ip") ..
but i couldn't connect.
(but i can work device properly using one computer and through it's own telnet client)
how to do that without router or any other thing.
pls help me..