A bootloader is what loads the kernel into RAM and transfers control to it from the BIOS.
launches the bootloader
You can make it the default option in the bootloader. Or you could reinstall the Windows bootloader, but it will not allow you to boot Linux without modification.
BootX
It depends on the size of the disk drive(s) and what kind of bootloader you have. With the right bootloader you can put on as many as your hard-drives can handle.
No, the iPad's bootloader is locked
Fastboot protocol, which allows communication between the bootloader and the computer. Bootloader mode, where the device can be flashed with new firmware and partitions using fastboot commands. Fastboot commands, which are used to flash files, unlock the bootloader, and interact with the device during the fastboot process.
It means exactly what it says. The bootloader, SYSLINUX, could not find a kernel image on the boot media, thus it cannot boot the operating system.
GRUB is the bootloader for Linux operating systems. The bootloader is the section of code on the hard disk drive that is called and executed at bootup. It will load the operating system components and programs and start the operating system.
There is no the Linux bootloader. There are dozens of bootloader for Linux across multiple platforms. LILO, GRUB, ELILO, SYSLINUX, ISOLINUX, EXTLINUX, Das U-Boot, yaboot, SILO, Cromwell, EMILE, redboot, quik, Loadlin, Penguin, MILO, aboot, Palo, etc... are all examples of bootloaders used to boot Linux.
Sorry i don't think that's possible =(
Theoretically, almost any two operating systems can be dual-booted. The only requirement is that you have a bootloader that is capable of either loading multiple kernels, or can chainload another bootloader.