今までの Win7 環境では PuTTY を利用していた．
どこかで「Win10 は SSH クライアントがある」と読んだ記憶があった．

コマンドプロンプトで SSH と入力すると確かに入っている．

Microsoft Windows [Version 10.0.18362.113]
(c) 2019 Microsoft Corporation. All rights reserved.

C:\Users\Iwao>ssh
usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]
           [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
           [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]
           [-i identity_file] [-J [user@]host[:port]] [-L address]
           [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]
           [-Q query_option] [-R address] [-S ctl_path] [-W host:port]
           [-w local_tun[:remote_tun]] destination [command]

C:\Users\Iwao>where ssh
C:\Windows\System32\OpenSSH\ssh.exe

起動方法は次のような感じ．

ssh  -l  ユーザ名  IP

C:\Users\Iwao>ssh -l Iwao -p 22xx 192.168.x.xxx
The authenticity of host '[192.168.1.xxx]:22xx ([192.168.x.xxx]:2200)' can't be established.
ECDSA key fingerprint is SHA256:1mYs5QSMxI2oljDmQWQ3rMG4tP0BKatu5N5fe555Ga0.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[192.168.1.xxx]:22xx' (ECDSA) to the list of known hosts.
Iwao@192.168.x.xxx's password:
Iwao@DS115j:~$ ll
total 56
drwxrwxrwx+  8 Iwao users 4096 Apr 19  2018 .
drwxrwxrwx+ 11 root root  4096 Jul 21  2017 ..
drwxrwxrwx+  5 Iwao users 4096 Apr 13  2017 CloudStation
drwxrwxrwx+  3 Iwao users 4096 Apr 19  2018 gcc_test
-rwxrwxrwx+  1 Iwao users  613 May 30  2017 set_ds_inc.sh
drwxrwxrwx+  2 Iwao users 4096 May 25  2017 .ssh
drwxrwxrwx+  2 Iwao users 4096 Sep 25  2017 Temp
drwxrwxrwx+  4 Iwao users 4096 Aug  2  2017 Test
drwxrwxrwx+ 25 Iwao users 4096 Feb 14 22:38 www
Iwao@DS115j:~$ pwd
/var/services/homes/Iwao
Iwao@DS115j:~$

起動を簡単にするために，次の内容で bat ファイル を作成．
cd %TMP%
ssh -l Iwao 192.168.0.123

次の様な指定も可能．
ssh -l Iwao DS115j