Applications shared between 2 user accounts

Running Vista home premium. As an administrator, I have created 2 additional
accounts for my children. But these 2 users have no access to some programs
or applications, and I want to allow them to access them when they login
using their accounts. For instance, I want them to be able to open Windows
Mail which was created by the Administrator. Also, some other applications
that they should be able to use without having to login as administrator.
Currently, when they attempt to enter these application, the system prompts
for the administrator password.

How this can be set to have some programs shared between user accounts?
What I have to do? If this is possible, I appreciate some step-by-step
guidance.

Thanks for your help