To communicate with the TI-Smartview software using a TI-84 Plus/Silver Edition, just do the following:

Ensure you're running OS 2.40 or higher with _GetBaseVer.
Call _EnableSmartViewInputPad (530Bh) with A=1.
Recycle the USB connection (disconnect and force it to reconnect) by calling _RecycleUSB (5311h).
You might want to do some sort of delay here (like use a 100ms timer delay). Or not.
In a loop:
	Call _IsConnectedToPC (530Eh). If this returns Z, get out of the loop because the cable was removed.
	Call _HandleLinkActivity (4C9Ch) so interrupts and stuff like that can process.
	Call _SendSmartViewKeypress (5308h) with B = modifier and A = keypress as many times as you like.
When done, call _EnableSmartViewInputPad (530Bh) with A=0 (this disables the ability for the calculator to show up as a SmartView Input Pad).
	Call _RecycleUSB (5311h).

Now for the modifier / key code table:

Keypress:	Modifier:	Key Code:
ON		0Dh		3Eh
2ND		09h		3Fh
Y=		09h		3Ah
WINDOW		09h		3Bh
ZOOM		09h		3Ch
TRACE		09h		3Dh
GRAPH		09h		3Eh
MODE		0Dh		3Fh
DEL		0Fh		3Dh
ALPHA		09h		40h
X,T,(theta),n	0Dh		40h
STAT		0Fh		3Eh
MATH		09h		41h
MATRX		0Dh		41h
PRGM		0Fh		3Fh
VARS		0Bh		3Bh
CLEAR		0Bh		42h
x^-1		09h		42h
SIN		0Dh		42h
COS		0Fh		40h
TAN		0Bh		3Ch
^		0Bh		44h
x^2		0Dh		3Ah
,		0Dh		43h
(		0Fh		41h
)		0Bh		3Dh
/		09h		54h
LOG		0Dh		3Bh
7		0Dh		44h
8		0Fh		42h
9		0Bh		3Eh
*		09h		55h
LN		0Dh		3Ch
4		0Fh		3Ah
5		0Fh		43h
6		0Bh		3Fh
-		09h		56h
STO->		0Dh		3Dh
1		0Fh		3Bh
2		0Fh		44h
3		0Bh		40h
+		09h		57h
0		0Fh		3Ch
.		0Bh		3Ah
(-)		0Bh		41h
ENTER		09h		58h
UP		09h		52h
DOWN		09h		51h
LEFT		09h		50h
RIGHT		09h		4Fh

NOTE: to send the ON key, you might need to call _SendSmartViewKeypress (5308h) again with A=0 and B=0 afterward. Can't hurt.

That's all there is to it...no need for that silly 16KB SmartPad application.

Assuming anyone actually uses TI-SmartView, I hope this helps somebody.