Why: Keep Oracle Net connection alive from client side so VPN or anything won't kill the connection

How: Save the following to file KeepSqlplusAlive.vbs, and type KeepSqlplusAlive.vbs (or wscript 
KeepSqlplusAlive.vbs or cscript KeepSqlplusAlive.vbs). Abort by killing wscript.exe (or cscript.exe) 
in Task Manager.

Note: If you need to keep multiple sqlplus windows alive, separate them with at least 500 ms delay. 
Use customized title (console command, e.g. "title system@dbconn2").

'KeepSqlplusAlive.vbs: Keep Sqlplus session alive
Set WshShell = WScript.CreateObject("WScript.Shell")

WScript.Sleep 500
while true
'Change console window title to what you see; only the first part is needed
WshShell.AppActivate "C:\Windows\system32\cmd.exe - sqlplus"
WshShell.sendkeys "select 1 from dual;~"
'WScript.Sleep 500
'WshShell.AppActivate "system@dbconn2"
'WshShell.sendkeys "select 1 from dual;~"
WScript.Sleep 60000
wend