Hello Mr. Erik. You said

"
Not posessing the knowledge found in these documents will lead to other (possibly costly) mistakes. I do thus emplore those of you that do not understand things like 'port pins as input' to gain the wisdom found in these 3 documents.
"

If you could mention the names of the 3 documents out of the 323 documents on the website, It would have been very helpful!

Secondly, I have read the ATMEL programmer guides. All have used some buffer in between!

Can anyone tell me how to get input from a pin briefly??

If God has given you knowledge, you should share it with others, rather than sit like a miser! Your knowledge will only grow more, it will never decrease!

Regards
Aman