Page Borders on Specific Pages, followup to an answer from another question

The following is an expanded version of the answer you quote.

% noborderprob.tex SE 559677

% the following code mainly from SE 404749
documentclass{article}

% PW added the folowing code
usepackage{lipsum} 
usepackage{ifthen}
newboolean{borderon} 
newcommand{borders}{setboolean{borderon}{true}}    % have borders
newcommand{noborders}{setboolean{borderon}{false}} % no borders
borders
% end of addition

usepackage{calc}
usepackage{eso-pic}

newlength{PageFrameTopMargin}
newlength{PageFrameBottomMargin}
newlength{PageFrameLeftMargin}
newlength{PageFrameRightMargin}

setlength{PageFrameTopMargin}{1cm}
setlength{PageFrameBottomMargin}{1cm}
setlength{PageFrameLeftMargin}{1cm}
setlength{PageFrameRightMargin}{1cm}

makeatletter

newlength{Page@FrameHeight}
newlength{Page@FrameWidth}

% PW modified the AddToShipoutPicture to output nothing for borderon=false
AddToShipoutPicture{
  ifthenelse{boolean{borderon}}{%
  thinlines
  setlength{Page@FrameHeight}{paperheight-PageFrameTopMargin-PageFrameBottomMargin}
  setlength{Page@FrameWidth}{paperwidth-PageFrameLeftMargin-PageFrameRightMargin}
  put(strip@ptPageFrameLeftMargin,strip@ptPageFrameTopMargin){
    framebox(strip@ptPage@FrameWidth, strip@ptPage@FrameHeight){}}}
{}}

makeatother

begin{document}

section{Test}

% PW added the following code

lipsum 

lipsum 

noborders % stop page borders

lipsum

borders % start page borders

lipsum

end{document}

This starts off with pages having borders. To stop the bordering put noborders on the page which you want to be borderless. Put borders on the page where you want bordering to start again.