Changing the Telnet Scroll-Back Buffer Size

By default, the Telnet session has a window size of 25 lines. To increase this so you can scroll back
and look at a larger number on lines:

Start Regedit
Go to HKEY_CURRENT_USER \ Software \ Microsoft \ Telnet
Double-click on the entry Rows in the right hand panel
Increase the decimal value to one that suits your needs.