DOS file handle I/O

[D Murphy]

Hello, I ask your forbearance for a few questions:

1. After getting fed up looking through manuals to find out how to get
   TC2.0 to let me directly access DOS the DOS functions for handle I/O,
   as I wanted to read 64K chunks of files, I wrote my own to call the
   relevant intdosx(). This worked but could someone please tell me how
   to do it using things like *fdopen() ? This in the interests of
   portability.

2. A handle is an int - how does DOS use file handles at low level ?

Murff...