INT 21,42 - Move File Pointer Using Handle

AH = 42h

AL = origin of move:

00 = beginning of file plus offset (SEEK_SET)

01 = current location plus offset (SEEK_CUR)

02 = end of file plus offset (SEEK_END)

BX = file handle

CX = high order word of number of bytes to move

DX = low order word of number of bytes to move

on return:

AX = error code if CF set (see ~DOS ERROR CODES~)

DX:AX = new pointer location if CF not set

- seeks to specified location in file