VS 2010 [RESOLVED] Idea's regarding a parent app with added modules/mini apps

Hi

I find myself rewriting these small apps for people all the time which do very basic things, usually rearranging files, merging, parsing etc, so im trying to come
up with an application where i can incorporate everything into 1 application,
the idea is....

1. have a parent application with simple ui which will 'host' the other functions/mini-apps

2. be able to add/remove functionality by simply adding/.removing a 'File' into a directory which the parent application will check for

3. have any found files listed in a toolbox/ribbon on a button which you click and using the information on the parent will kick into action

my initial idea 'for practice purposes' was, having the mini-app as console apps and winform apps and launching them from the parent and maybe pass arguments or have a global class available for them to get the information they need. which leads to question 1

Question 1....

assuming i have 2 projects open each with a form with a button and a label, how do i make them communicate to eachother by......

pressing the button on app1 form GIVES the text in the label to the other apps form
and
pressing the button on the app2 form REQUESTS what is on the label of the other form.

so simply put, SEND and REQUEST between applications


Question 2....
going back to my parent child app idea, should i be making dll's not mini-apps?
if so, how do i add 'random' dll's to an already compiled program (extensions)

thanks