> 	This example shows how to use Fl_Text_Display as a 
> 'terminal' of sorts:
> 	http://seriss.com/people/erco/fltk/#Fltk-tty
> 
> 	Basically, Fl_Text_Display::append() is used to keep appending
> 	lines to the widget.
> 
> 	But it doesn't show how to limit the scroll buffer; I 
> imagine you
> 	could test the size of the buffer before adding lines, such that
> 	if it's too large, you can use remove() [and the 
> line_xxx() functions]
> 	to delete lines off the top before append()ing them.
> 
> 	Not sure what kind of memory problems you might run into; try it
> 	and see.
> 
> 	Fl_Browser works too, but doesn't provide a way for the user
> 	to highlight individual characters for copy/paste.

I did pretty much this using Fl_Browser in the past - limited the buffer to about 1000 lines, and kept a count of each line I added... Once I got past 1000, for every line I added, I removed line number 1 (and kept my count constant...)
All the management of the lines was left to the browser. Worked.
Would not care to comment on memory fragmentation issues, mind you!