If Rigol wants to reproduce the Window trigger as specified by most other sources (which is a single defined Window), then the Enter / Exit button names need to be reversed - and the Rise / Fall names should be changed to one of the suggestions previously mentioned.
i dont agree, read your post careful,
T2 is a window and T1 is a window,
if rise =true and exit=true,
then the T2 window is all that is >= T2 level
then the T1 window is all that is >= T1 level
so the first event is when a signal enters window T2, then if next sample is bigger
then window T2 is true;
If the signal rises futher: then when input == level T1, it ENTERs window T1.....
if the signal grows further it is still in window T1
Then if the signal goes down....( not rise)... and it crosses the boundery of T1, it EXITs window T1
So in my opinion Rigol is correct, in enter en exit..