Modularising Code

Mike Kerner MikeKerner at
Thu May 8 14:20:31 EDT 2014

Definitely use substacks to modularize your code, BUT, I would suggest you
do just a wee bit of reading on the message path, because it's important
for everyone, and all of the questions you asked are discussed there:
1) In the LC toolbar at the top, the second-to right button is "Resources".
 Click it
2) The second link down is the "User Guide".  Click it
3) Inside there search for "message path".  There is a whole discussion of
what it is and how to use it.
4) SEND and PASS and START USING STACK are your friends.

On Thu, May 8, 2014 at 11:57 AM, Terence Heaford
<t.heaford at>wrote:

> My understanding is if you create a library of a stack it’s stack script
> is placed between the main stack that has called start using and LiveCode’s
> engine.
> Is that correct?
> If yes then I presume if you start using a substack then the substack
> script is placed between the main stack that has called start using and
> LiveCode’s engine
> Is that correct?
> If you only have handlers in the stack script of the substack then any
> messages will only call them after passing through the mainstacks script.
> Is that correct?
> If you actually use the substack as more than a repository for scripts
> then any control will pass the message through the substacks script to
> mainstack and onto the substack again.
> Is that correct or once you start using the substack is it removed from
> the normal message passing and any control only passes to the substack
> script and onto the engine?
> I hope the above is understandable.
> All the best
> Terry
> On 8 May 2014, at 14:37, Dar Scott <dsc at> wrote:
> > Remember that the main stack is in the message path of the substack.
>  So, you will have the main stack twice in the message path for cards and
> controls.  This is probably fine.  But, something like a keystroke counter
> in the main stack might count them twice.
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