>Hi Mike.
>Not the best approach but I think that this will help...
>
>#If File(Sys(2004) + "vfp9.exe")
> * Development mode
>#Elif
> * Run time
>#Endif

Hm, this will work only if you compile something at runtime.

My solution is to set a constant. Something like

#DEFINE dlDebugMode = .t.

in a global / general header file

in your main.prg do

#IF dlDebugMode THEN
*only compiled in if dlDebugMode
 IF _VFP.STARTMODE#0 THEN
  messagebox('debug')
  return
 ENDIF
ENDIF#

anywhere where you need code at debug time only

#IF dlDebugMode THEN
*only compiled in if dlDebugMode
 your debug stuff
#endif

don't miss to compile without debug information!

HTH

Lutz