Below, in alphabetical order is a list of laptops by brand only (no models) and the known hot-key combinations used to switch the laptop to its external VGA mode.  There are three main column areas:  brand, hot-key to be used in conjunction with the Fn key (Fn + F3), and what you should expect to see on that key (icon, lettering, etc.)  Multiple keys indicate different models within that brand using different keys.

Brand	Hot-Key	Key Marking
A _
ACER	F3, automatic	icon
ALTIMA	F7	icon
AMS	F2, F3	crt/lcd - 'T' key
ARC	T' key	icon
ARM	F3	icon
AST	F3, F5, F10, F12	icon or crt/lcd
AT&T	F3	crt/lcd
AUSTIN	F6	icon
B _
BRADAX BSI	F6	icon & crt/lcd
C _
CANON	F7	icon - crt/lcd
CHEMBOOK	'T' key, F6	con or crt/lcd
COMPAQ	F2, F3, F4	icon (may require converter  at boot)
COMPUAD	BIOS setup
CTX	F3, F7, F9	icon
D _
DAEWOO	Refresh tab in Display Properties - Bios F2
DELL	F8 (CTRL F11)	crt/lcd or icon
DIGITAL	F4 *	icon
	* one model requires monitor at power up
DPS	Has Chips tab with Crt-LCD-Both setting
DUNN	F6	icon
DTK	F4	no markings
E _
EPS	F7, F10	icon, "T" key
EPSON	F12	icon
EVEREX	F10, F12	icon
F _
FUJITSU	F5,  F10 *	icon 'display'
-	* Refresh tab in Display Properties
-	* one model requires monitor at power up
G _
GATEWAY	F3, F8 *	lcd/crt or icon (may not be labeled)
-	* Try F1 if  no key marked for crt mode
H _
HITACHI	F7, F8, F12	crt/lcd
HP	F5 *	icon
-	* no icon - try Print Screen
I _
IBM	F1, F3, F6, F7, F8	icon or crt/lcd
IDP	F9	icon
INCA	F12	icon
J _
JETBOOK	F12	lcd/crt
JETTA	F10	icon
L _	-
LEADING EDGE	BIOS
M _	-
MAGITRONIC	F4, F9	icon
MIKON	F6	crt/lcd
MICROTRONIC	F4	no markings
MICRON	F2, F12 *	lcd/crt or icon
-	* Transport has 1108 chip in it - software conflicts
MIDWEST MICRO	F12	icon
MITSUBA	display switch tab in Properties
N _
NEC	F3, F7, F8, F10, "Display"	icon or lcd/crt
O _
OLIVETTI	F4	icon
P _
PANASONIC	needs to shut down (automatic), program utility
	[use radio button on Display Properties, Chips card]
PSION NOTE (LEO)	F12	icon
PROSTAR	F6	crt/lcd
R _
ROYAL	Chips tab in Display Properties
S _
SAGAR	F6, F9 *	icon
	* if not marked try F4
SAMSUNG	F4, F5, F6	crt/lcd
SEPTRA	F8	crt/lcd
SHARP	F5	icon
SONY	F7	lcd/crt
SOUND BOOK	F12	icon
T _
THINBRICK	F12	crt/lcd
TI EXTENSA	F3, F9, F10, F11, F12	icon
TONELY	F7	icon
TOSHIBA	F5 F7	icon
TROGON	F12	crt/lcd
TWIN HEAD	F5	icon
W _
WINBOOK	F8, F10, F12 (Ctrl+Alt+F10)*	lcd/crt 'display'
	* keys only work in DOS mode
	F6	'Simul'
Z _
ZENITH	F10	icon or crt/lcd