int _is_remote_handle(int fhandle);
Given the file handle of an open file in fhandle, this function returns non-zero if the drive where that file resides is treated by DOS as a remote (networked) drive, or zero otherwise. It does so by calling subfunction 0Ah of the DOS IOCTL function (interrupt 21h, AX=440Ah) and looking at bit 15 of the device attribute word returned in the DX register.
Note that DOS treats CD-ROM drives as remote.
Zero for files on local drives, non-zero for files on remote and CD-ROM drives.
not ANSI, not POSIX
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