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Programs like page defrag by sysinternals or the chkdsk utility that run on startup. Please enlighten me. What kind of programming language do they use for these kinds of operations.
What usually happens is that the developer creates a booter loader that they load on storage device (such as HDD, CD/DVD, USB, etc).
The bootloader has (if I remember correctly, it’s been over 8 years since I did this) 512K address to point to a startup register (usually
08h). That 512K address will store your address to your environment variables, startup address, etc.The developer then writes a program and sets his
mainmethod to point to the startup boot address (usually08hbut that is not standard, it is vendor specific) so that when the bootloader points to the startup address, the program connected to the startup address is booted and run.Language, hardcore C/C++/Assembly (or Pascal since it is capable of doing so).