At this point you have to decide whether or not you want to
include the abstract on the titlepage.
If you wish to do so this is the time to type
abstract.
This will cause TEX to typeset the word ABSTRACT in the center
of the next line of text, skip the appropriate amount of space
and set you up in a new paragraph.
The next thing you do is type in the body of the abstract.
If you don't put the abstract on the titlepage then you
carry out this sequence of commands after you have finished the
titlepage with the command
endpage.
After you type in the abstract on the second page you should force
TEX to print this as a separate page by once again typing
endpage.
This will produce an abstract on its own page with white space
above and below the text.
If you are in the situation of having an abstract which is too
long for the title page but too short to fill the entire
second page you will get ugly output if you type it in
and follow it with the command
endpage.
TEX will simply shove everything to the top of the
page because
endpage is the same as
vfil
break.
The way to force TEX to center the title and material is to type
vfil
abstract
text of abstract
endpage