>am I executing a form, from the menu and from another form how I can know, in the moment in that I execute it of where it proceeds?

I don't think there is an easy way to obtain this information. I would just pass a parameter to the form, depending on what you want to do later on:

* Call up form
do form MyForm with "Option 1"

* Form Init(): Save parameter
lparameters tcFormOption
ThisForm.AddProperty("cSomeOption", tcFormOption

* Use the parameter in any part of the form
if ThisForm.tcFormOption = "Option 1"
  ...
endif