Sending packets using an specific port

[vertigo_one]

Hi, is it any way I can send a packet using an specific port?, for example, what would I have to do if I want to send a packet using the source port xxxx? Thx in advance Vertigo Real Programmer isn't who just knows how to use a programming tool, Real Programmer is who knows how to write cool stuff in any language, 'cuz he/she/(it!!?) thinks like a machine :cool:.