Info in the hts-log file

1. Note: due to www.example.com remote robots.txt rules, 
links begining with these path will be 
forbidden: /images/, /gdx/ (see in the options to disable 
this)

question1 : what's a robots.txt
question2 : why using great care by disabling the 
robots.txt rule option 
question3 : what's the filter for downloading files in the 
images and gdx directory

2. Unable to get server's address" (-5) after 2 retries at 
link www.example.com  (from primary/primary)

question : I have mentionned 2 sites - is there a chance I 
can enter this site ?