?BRANCH
* ?BRANCH ( -- )

compiles a cond-branch-runtime into the dictionary that
can be resolved with gt;MARKd or RESOLVEgt;.
Usage:
     ?BRANCH MARKlt;     or
     ?BRANCH gt;RESOLVE  or ...
this is the runtime-portion of IF - the use of
IF should be preferred. See also >BRANCH

system ordinary primitive