How creat a app to send posts to any account that we have username/pass?


#1

Hi,
How creat a app to send posts to any account that we have username/pass?
I have seen some websites that we only give a username / pass and confirm the access and then the website can
send post´s to my account on twitter.
I have seen the develop area and creat a app but i only can send posts to my account.
How can i do this? send to any account that i have login credencial and not id client etc.
thanks for your help