Editing High memory area (section)

== Notes ==
{{Reflist|group="nb"|refs=
<ref group="nb" name="NB_Backdoor">A stub is not necessary for the resident system extensions [[SHARE (DOS command)|SHARE]] and [[NLSFUNC (DOS command)|NLSFUNC]] under [[DR DOS 6.0]] and higher, because they only hook the multiplex interrupt INT 2Fh and can therefore utilize a backdoor interface to hook into the interrupt chain in [[kernel space]] so that the kernel's gate [[A20 handler]] will provide the functionality of the stub.</ref>
}}