Tandy 600 Programmer's Reference Manual page 106

Function
17h
-
Open Query
Definition
Record
Parameter Block:
00
01
02
FILE-HANDLE
BUFFER
BUFFEFL-SEGMENT
File Identifier
Offset of buffer
Segment
of
query key
buffer
Return Value:
AX:
STATUS
Error
code
The
FILEHANDLE
parameter contains the
file
handle
of
an
opened database
file
for
which a
query key
is
being constructed.
The
BUFFER
and
BUFFERSEGMENT
parameters specify the
segment and
offset to
the buffer
which
contains the
query key
being defined.
Error Returns:
101