You can create a mennu, each pad would be one of your three options, and a fourth pad to allow you to exit the menu.

You can either open a procedure for each option or call a command like do myapp1, do myapp2, etc

Presumably each app is in its own directory. Therefore you would be better off by creating a procedure for each menu pad with code like this:

cd \applications\app1

do app1

In another procedure you would do:

cd \applications\app2

do app2

etc