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They need to be typed
Yes, "keyed" at the bottom of a letter or memo indicates the person who typed it. It helps identify the individual responsible for preparing the document.
A legal signature must be written by hand, not typed.
I would not recommend a typed signature on any letter unless you are sending it electronically. In all cases, a physical letter should have the actual signature of the sender. The recipient of a letter of recommendation that has a typed 'signature' will not hold the recommendation in high regard. A photocopy of a signed letter is preferable to a typed signature.
not originally. at first, it was written by hand. now, you can find it typed.
Different types...can be different fonts. Different types...can be: personal (family, friends), or formal (business). Different types...can be: hand written, typed on a typewriter or word processor, or typed on a computer.
No, a standard business letter is typed in "portrait". Standard pages of any kind containing text only are normally typed in "portrait".
a hand written or typed composition
Yes.
It means what it says. It is a document that you have created, you have typed it using MIcrosoft Word.
if an answer is required then either will do.
a typed letter in Microsoft word