DebuggerGetMax
DebuggerGetMax Get the highest function number supported
#include <Memory.h> Memory Manager
Debugger Support Under Virtual Memory
The DebuggerGetMax function returns a long integer indicating the highest
function number supported by the DebugUtil trap.

Notes: The returned value is the highest selector number of the debugger
functions that are defined in terms of the DebugUtil trap. See the section,
Debugger Support Under Virtual Memory for a complete list of
these numbers.