is_single the_ID

you could try to save the current post id into a variable (at the start of the template, before your query; i.e. $current_id = $post->ID;); then compare it in the query list.

imho, is_single() would not work in a list of multiple posts;
besides, the_ID() would output an post id, but would not be available as a string, you need get_the_ID() for that.

Thanks for that. You are correct

is_single() is not working within query posts. How can I get it to function?

example: (written without any syntax where not neccessary)

get_header;

<?php $current_post = $post->ID; ?>

query_posts();if(have_posts()):while(have_posts()):the_post() THE LOOP

<?php if( $post->ID == $current_post ) { echo 'this post from the list is the current post'; } ?>

endwhile;endif END OF LOOP
get_footer

to get the current post id at the stasrt of your template, use this line:
<?php $current_post = $post->ID; ?>

to check the posts in the query posts list, use this line:
<?php if( $post->ID == $current_post ) { echo 'this post from the list is the current post'; } ?>