Your BIOS is your basic input output system
To get to it
Delete: AMI or Award BIOS.
Esc: Toshiba
F1: Toshiba; Phoenix; some IBM PS/1 models.
F10: Compaq.
F2: NEC.
Insert: IBM PS/2.
Tab: eMachines.
Reset button (press twice): Some old Dells.
Ctrl-Alt-+: Various computers.
Ctrl-Alt-?: Some old IBM PS/2 models.
Ctrl-Alt-Enter: Some Dells, others.
Ctrl-Alt-Esc: AST, Tandon, others.
Ctrl-Alt-Ins: Zenith PCs, Phoenix BIOS.
Ctrl-Alt-S: Phoenix BIOS.
Ctrl-Alt-Shift with Del (on number pad): Olivetti.
Ctrl-Esc: Many PCs.
Ctrl-Ins: Some IBM PS/2s.
Ctrl-S: Phoenix BIOS.
Ctrl-Shift-Esc: Tandon