How can I change my User name and password on a PC?

For simplicity I want a new PC to have the same user name and password as my other two PCs. The computer names are different and that is fine. I can add a new user name in Properties but how can I transfer all of my settings and and desktop to the new User Name?

Andy Hutchinson
Video Magic
Winter Park, Fl

OS-10.3.4, FCP4.5, SP 2.05, Dual 2.5 G5, 2 gigs RAM; Sys HD 200G : WD 200G 7200rpm with 8 Meg buffer; 2 WD 250G 7200 rpm with 8 Meg buffer FW enclosure; Lacie FW800 card; Maxtor 120G FW for storage, 1 WD, L