COMMANDS:		RESPONSE:		USEFUL:
freq 			Usage			
dac 			Usage
sweep_voltage 		Usage and Value 
saveconfig 		N/A
clearconfig 		N/A
zero 			Usage and Value (?)
pause 			N/A
resume 			N/A
caloutput 		N/A
save 			N/A
recall 			N/A
trace 			N/A
trigger 		Usage
marker 			Value	
usart_cfg 		Value
vbat_offset 		Value
color 			Value
if 			Usage and Value
actual_freq 		Value (?)
attenuate 		Usage			Possibly
level 			Nothing
sweeptime 		Usage			Yes
leveloffset 		Value
levelchange 		Usage
modulation 		Usage
rbw 			Usage			Yes
mode 			Usage
spur 			Usage			Possibly
load 			N/A
ext_gain 		Usage			Possibly
output 			Usage
deviceid 		Value
correction 		Value (?) 	
calc			Usage			Yes

OTHER COMMANDS: 
version 		Value
reset 			N/A
data 			Value
frequencies 		Value
scan 			N/A
scanraw 		N/A
sweep 			Value		
test 			Nothing			Possibly
touchcal		N/A 
touchtest 		N/A
usart 			Nothing
capture 		N/A
refresh 		Usage
touch 			N/A
release 		N/A
vbat 			Value		
help 			N/A
info 			Value
selftest 		Nothing			Possibly
threads			Value

For COMMANDS Column:
These are taken from the "help" command list.
 
For RESPONSE Column:
"Value" means a value or values are returned.
"Nothing" means there is nothing returned.
"Usage" means a usage reminder is returned.
"N/A" means not applicable or not tested.

For USEFUL Column:
"Yes" means I would really like this parameter.
"Possibly" means it may be useful to a user.

Where there is (?) I'm not entirely sure what the return value is telling me.