Sniff application's sent packets

Hi. I'm new on these forums ^^, but I already got some Delphi experience and a little assembly experience too. I'd like to know how can i capture the packets sent by a process to a remote computer. I heard I need to hook some Windows API functions, but I got no idea how to do it. And I'd also like to know if it's possible to know what instructions is a certain process doing. For example, i click a button on an application, is there any way to capture the procedures/functions it uses when i click it? Thanks in advance :)
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