🚀 go-pugleaf

I'm looking for a way to block out large portions of input from a
Latex document.  This is so I can prevent the printing out of selected
sections of a large document.  Of course I could just put % in front
of every line of the section I want blocked out, but this can be a
real pain for large sections of text.  It would be much nicer if I
could just do something like
    \begin {blockcomment}
    blah...blah...blah
    \end {blockcomment}
 Everything between the begin and end would be ignored.  Does anyone
know how to do this or could some guru-type whip up a macro for this?
Thanks,

David Sturman
MIT Media Lab
djs@media-lab.media.mit.edu