All what I use in VFP9 SP1, except the report apps.
Anyway, some apps are available in VFP7-9 and use ANCHOR ICASE TRY CATCH EVL etc.
Lot of work is done via compile switches.

Think on something like

*h file
#IF VERSION(5)<800 THEN
 #DEFINE dnVersion7_Prog			'YES'	&& Ist älter als Version  8.00
#ENDIF &&VERSION(5)<800
#IF VERSION(5)<900 THEN
 #DEFINE dnVersion8_Prog			'YES'	&& Ist älter als Version  9.00
#ENDIF &&VERSION(5)<900
#IF VERSION(5)<1000 THEN
 #DEFINE dnVersion9_Prog			'YES'	&& Ist älter als Version 10.00
 #IF RIGHT(VERSION(4),4)='5815' THEN
*SP2
  #DEFINE dcV9SP				'5815'
 #ELSE &&RIGHT(VERSION(4),4)='5815'
  #IF RIGHT(VERSION(4),4)='3504' THEN
   #DEFINE dcV9SP				'3504'
  #ELSE &&RIGHT(VERSION(4),4)='3504'
*VFP9 vanilla
   #DEFINE dcV9SP				'2412'
  #ENDIF &&RIGHT(VERSION(4),4)='3504'
 #ENDIF &&RIGHT(VERSION(4),4)='5815'
#ENDIF &&VERSION(5)<1000

*prg
#IFDEF dnVersion7_Prog THEN
*Only if version lower the VFP 8
 #DEFINE REMOVEPROPERTY				*
 #DEFINE DOEVENTS				DOEVENTS()

PROCEDURE EVL
 LPARAMETERS;
   tv1,tv2
 RETURN IIF(EMPTY(tv1)tv2,tv1)
ENDPROC &&EVL
#ENDIF &&dnVersion7_Prog

#IFNDEF dnVersion7_Prog THEN
TRY
blabla
catch
endtry
#ELSE &&dnVersion7_Prog
on error
blabla
#ENDIF &&dnVersion7_Prog

There is a stack of h files, and somewhere in it's top those constants are defined. All what I need is to compile with the target version.

for example my startup looks like

#IFDEF dnVersion7_Prog THEN
 IF VERSION(5)>799 THEN
  MESSAGEBOX('Falsche Version',MB_IconInformation)
  RETURN False
 ENDIF &&VERSION(5)>799
#ELSE &&dnVersion7_Prog
 #IFDEF dnVersion8_Prog THEN
  IF !BETWEEN(VERSION(5),800,899) THEN
   MESSAGEBOX('Falsche Version',MB_IconInformation)
   RETURN False
  ENDIF &&!BETWEEN(VERSION(5),800,899)
 #ELSE &&dnVersion8_Prog
  #IFDEF dnVersion9_Prog THEN
   IF !BETWEEN(VERSION(5),900,999) THEN
    MESSAGEBOX('Falsche Version',MB_IconInformation)
    RETURN False
   ENDIF &&!BETWEEN(VERSION(5),900,999)
   IF !RIGHT(VERSION(4),4)==dcV9SP THEN
    MESSAGEBOX('Falsches Servicepack',MB_IconInformation)
    RETURN False
   ENDIF &&!RIGHT(VERSION(4),4)==dcV9SP
  #ENDIF &&dnVersion9_Prog
 #ENDIF &&dnVersion8_Prog
#ENDIF &&dnVersion7_Prog
<pre>

>How do you develop in SP2 but distribute in SP1? What if you develop something that is not available in SP1?
>
>>SP2 broke data group headers repeated on subsequent pages bug stopps me from using SP2 I use it for development but distribution will be on SP1 with the reportapps from SP2 compiled under SP1.