1. According to the online tutorials, created a and b two virtual environment, directly in the C: \ users workon into one of the environment, install django1.11, found that the success of the installation, except two virtual environment become django1.11 primary environment also install a 1.11, after my test, found that have to enter a virtual environment Scripts directory to install django to install django version only in the virtual environment effectively, but I don't see online tutorial into the Scripts to install, is I install a virtual environment is there a problem?
2. And I workon a environment, then CD to b file directory, PIP list found django version shows the installed version b, on the outside of the virtual environment folder view is not installed django, that workon a what is the meaning of environment?

is different the operation of the virtual environment were to enter the corresponding environment to run under the folder? Or is all environment path to add? At the moment, I only add the python path, the main environment