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Understanding access list entries cisco 2811

Hi all
I need to understand the purpose and function of these entries in my router 2811 cisco:
Please explain each line and what it is doing in my router:


access-list 101 permit tcp host 132.xxx.xxx.xxx any eq 123
access-list 101 permit tcp host 209.xx.xxx.xx any eq 123
access-list 101 permit tcp host 66.xxx.xxx.xxx host 64.xxx.xx.xx eq telnet
access-list 101 permit tcp host 64.xxx.xxx.xxxx host 64.xxx.xx.xx eq telnet
access-list 101 permit udp host 216.xxx.x.x eq domain host 64.xxx.xx.xx
access-list 101 permit udp host 216.xxx.xx.xx eq domain host 64.xxx.xx.xx

Thanks
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risner_it:
Thanks for the pdf file really useful, but a beginner like me needs to know what the actual lines are doing in my case;
-Please explain what is port 123 stands for and what is it doing, it is my concern as ip address 132.xxx.xxx.xxx is not from our domain.
-Please explain what is port 123 stands for and what is it doing, it is my concern as ip address 209.xx.xxx.xxx is not from our domain.
-The two telnets I am sure they belong to our isp, which can access the router in case of emergency change.
-Again what are the last two lines, please note that the 64.xxx.xx.xx is our routers external address.
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the 216.x.x.x addresses in the last 2 lines are probobly dns servers--I should have added this to the above