The "Allow Non-Local Jumps" menu option set a
flag that is read by the OnAssertNewHTFile. This 
method is used to prevent jumps to new hypertext
files. (This could be done for security reasons.)

(Note: Assert methods normally are used to abort
all further processing of an action, while the
Handle Methods modify the processing. These
two methods can each be overridden in code by
direct assignment for Assert types and virtual
overriding for Handle types.)


