Hi,
The first and the foremost thing is that when a user tries to logs in he wont be allowed to enter the environment which he is not permissible to enter into. During the login process he would be asked to give the Environment and the Role.
i.e. if he is given environment JPD and PD he wont be able to login into JPY or PY or other environments.
Second,
If the end user is using fat client , he can see the logged on environment on the bottom part of the screen. That part would be giving 4 types information.
1) Where you are currently standing
By Default: Task View: EnterpriseOne Menus
2) Logged in username
3) Environment
4) Role the user has used to logged in
If the end users is thin client than during the login process , he would be asked to select the environment and the role that he wishes to use.
May be this has cleared your querries.
Regards,
Irfan