can wf use intent to start appliacation

for example I write wf and second app to show in app alert because wf can't...

btw, what is the differences between watch app and widget?

i planed to write something more, wf is in store, I have 2 df but need something else, something:

- what run in background and can read for example sensor's data  every minutes/second and if happened something special show alert

- what can show some data for example chart HR after activation

what to choose?