INT 1A - SNAP.EXE 3.2+ - "SNAP_GETANCHOR"
AX = 7101h
STACK:  WORD    anchor number (0000h-0009h)
Return: AX = anchor's value
STACK unchanged
Program: SNAP.EXE is a TSR written by IBM and Carnegie Mellon University
which implements the Simple Network Application Protocol

See also: 1A7002

1A7101 - SNAP.EXE 3.2+ - "SNAP_GETANCHOR"