By the ++ operators, I mean typing ++ between trim commands to join up, rather than having to type AlignedSplice and brackets.
To cut out frames 100 and 200 from a video, it might look like this:
AviSource("video.avi")
Trim(0,99) ++ Trim(101,199) ++ Trim(201,0)
I think that's right. I assume this is being done without audio, so I guess it doesn't matter whether you use aligned or unaligned splice. I just do it this way out of habit.