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From: ol.sc@web.de (Oliver Schmidt)
Newsgroups: comp.sys.apple2.programmer
Subject: Re: Good way to detect the current environment within ProDOS - launcher   or BASIC?
Date: Sat, 03 Aug 2013 10:12:21 GMT
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Hi David,

>I'd like to tell the current ProDOS environment underneath my program. 
>I want to quit differently depending on being launched from BASIC (just 
>RTS) or from the program launcher (ProDOS QUIT MLI call).

I didn't follow the reset vector approach pointed out by others.
Instead I look at the ProDOS system bit map:

https://github.com/oliverschmidt/cc65/blob/master/libsrc/apple2/crt0.s

Lines 143 to 146:

; Check ProDOS system bit map
lda     $BF6F           ; Protection for pages $B8 - $BF
cmp     #%00000001      ; Exactly system global page is protected
bne     basic

Regards,
Oliver