You can perform a silent installation by using the /q command line option with the atw2k40se.exe installation file. You should create a setup.ini file and save it in the same folder as the installation file. You can preset the answers to most of the setup dialogs using this file. Edit the file with notepad, and remove the leading semi-colon from any item you want to use, and remove the trailing comment.
While there is not a way to set up the default session file, you can install a pre-configured session (.atcf) file by placing it in the \VARFILES\HOME directory under the directory containing the installation file.
; Custom setup configuration for AccuTerm 2000
; To use this custom setup file, remove the leading semicolon
; from the item you want to define, and replace the ?? with the
; value you want to use. Be sure to remove the comment after
; the value! Place this file in the same directory as the
; installation file(s).
; Items which can be defined:
;MAINDIR=?? - define product directory
;HOMEDIR=?? - define user's home directory
;BACKUP=?? - backup replaced files to this directory
;GROUP=?? - specify the Start Menu group
;SHORTCUT="Y" - create shortcut on desktop
;SHORTCUT="N" - do not create shortcut on desktop
;ALLUSERS="Y" - shortcut created in "all users" profile
;ALLUSERS="N" - shortcut created for current user only
;CDKEY1=xxxxxxx - first part of CD Key
;CDKEY2=xxxxxxx - second part of CD Key
;NAME=?? - licensed user name
;COMPANY=?? - licensed company name
;LOCATION=?? - licensed location (for site licenses)