How to copy text from a document into another program?

[Fulci]

I need to make a macro that goes through the following steps

Copy one line of text from a text document
Paste the text into a field in a program
Push a button
Write 1 into a field
Push another button

Copy next line from the text document and repeat the above steps

If someone could give me some hints on how to do this I would be so happy.