how can i communicate picoCOMA5 with putty and SSH per LAN just like Raspberry-Pi?

hi folks,
I'm the newbie for picoCOMA5, but i got some experience at Raspberry Pi-B+.
On Raspberry everything is simple, i can operate it directly with HDMI-Display and USB-keyboard, or use Putty per Local-network (SSH must be activated).

However i googled a lot but didn't find the answer how to operate my picoCOMA5 (linux), i just know i might use the Serial port to communicate picoCOMA5, but how exactly and with what kind of Tools?

Can i also use putty and SSH per LAN to access it?

Thanks for your answer

Regards
Lee

Thanks for the helpful answer!

The following is my problem:
i can use Mozilla on my host (PC with windows 7) to access some html files on board (picoCOMA5) by typing such as 192.168.2.126.
But if i connetc from host to board with puTTY and same IP-Adresse, i got message such like "....Connection refused....."

If i can't connect the board, how can i generate new keys on this board and where can i type "ssh root@<ipaddress of board>"?

Thanks again!

Best regards
Lee