Basically, there are three ways to make input vary according to the processor, file loading, the hevea.sty style file and comments. However, better space control can be achieved by using the hevea boolean register or comments, see sections 5.2.4 and 5.3 . Relations between toimage and verbimage are similar. C H A logos. And one gets Luc.
Comments thus provide an alternative to loading the hevea package.
However, no environment is opened and closed and no scope is created while using comment equivalents.