Telnet operation Memcache hint is not internal or external

Elnet is not an internal or external command

Open Control Panel, open programs and features, and see a "Turn on or off Windows feature" on the left.
Open the Telnet server and Telnet client, check all 2 items, and then make sure you're OK.

I use in DOS: Telnet 127.0.0.1 11211 Connect to the host, to the Doc window input word characters invisible,

Only the horizontal bar (------) appears. What can I do to see the character when I enter a character?

Knock down the "enter" button, appear error, and then enter the character can be seen