123.hp.com/setup 3752 is a tailored URL for the HP DESKJET printer with model number 3752. All you need to do is visit 123.hp.com/setup and enter your printer number. The HP smart app can be downloaded from here only, and a wireless connection can be initiated. You 123.hp.com/setup can either go for a wired or wireless connection for carrying out the necessary tasks expected out of each HP printer model.