Multi-platform development.

[Alex Tweedly]

I'm considering developing a multi-platform app; i.e. ont where the same 
app runs on both "desktop" and mobile.

On the 'desktop' platforms it will use 'standard' menus, and that will 
be the main "command" access (along with an optional toolbar, most 
likely, but the toolbar will give access to a limited number of most 
often used commands/features, rather than to "everything).

But, on mobile, there are no "standard menus", and although they are 
appearing on a few apps (as homegrown menus), they aren't the usual 
convention on mobile devices. So, I will have a combination of icons, 
buttons, etc. on the mobile platforms.

I suspect that means I'm in the same boat as many other people have 
already been in, and I'd like to benefit from your experience.

If you have developed an app running on both desktop and mobile:

1. did you follow this same split on how your main command structure was 
invoked ?

2. how did you manage this ?
    a. really one app with per-platform customization
    b. two (or more) apps with as large a percentage as possible put 
into library stacks (or similar) as possible, with separate menu-based 
vs button-based apps.
    c. something else that you could readily explain :-)

Many thanks
Alex.