SMS_NTHG

This trap scans the Thing list. The Trap cannot be used in the QDOS and SMSQ/E operating systems. Look at the Notes here for a solution.

Call Parameters		Return Parameters
D0.B	$2B	D0.L	Error code.
A0.L	Pointer to Thing name/0	A0.L	Preserved.
A1.L	Unused.	A1.L	Pointer to next Thing linkage.

Errors

ERR_NF

Thing not found.

All registers not shown above are not used on entry and are preserved on exit.
If A0 is zero, the Trap finds the first Thing in the list. Otherwise it finds the next Thing in the list after the name to which A0 points.
On a successful return A1.L points to the linkage block of the next Thing. That Thing's name will be at $2A(A1). Setting that address in A0 and reentering the Trap allows the whole list to be scanned.