URL masking and redirection

Hi Guys,

I'm a new developer taking over an existing project that I'm not that familiar with and while running a few pages I came across some used urls that leads to same page!?

This two urls for example takes you tom the same page which is actually oneFldLogin.cls class although the url will show up as (http://34.196.215.250:81/us-spacesense/mobmtce/MSDS.UI.HandHeld.MobMtce.PMOrder.cls) and I'm guessing there url masking & redirection involved when accessing PMOrder to oneFldLogin but could see any call to oneFldLogin.cls in PMOrder.cls class so is there some setting in Ensemble that controls which class to be called ?   

http://34.196.215.250:81/us-spacesense/mobmtce/MSDS.UI.HandHeld.MobMtce.PMOrder.cls
http://34.196.215.250:81/us-spacesense/mobmtce/MSDS.UI.HandHeld.MobMtce.oneFldLogIn
.cls

Thanks