The hp support is actually a website which is set up by HP technicians to help people set up their HP Printer by downloading the printer drivers and other software through this website.
hp.com/support ,
http://www.hp.com/support ,
123.hp.com/setup ,

How to download and install HP printer drivers from 123.hp.com/setup?
Switch on the HP printer and computer.
Open web browser and type 123.hp.com/setup.
Enter HP Printer model number in the space provided.
Choose the printer driver.
Click on download button.