Applescript variable not usable in other script - variables

Question

I have made an applescript that sets variable 'msshutdown' to yes and then shuts down the computer. Now I have another script exported as an application added as a login item that starts up the program 'MainStage' if 'msshutdown' is set to yes and afterwards sets 'msshutdown' to no.
This is all because I want the computer to don't launch any apps at login, unless I shut it down using the first script.
But it seems the second script can't find the variable 'msshutdown'. How do I make the second script read thew status of the variable in the first script and then edit it?
First script:
set msshutdown to yes
tell application "Finder"
shut down
end tell
Second script:
if msshutdown is yes then
tell application "MainStage 3"
activate
end tell
set msshutdown to no
end if

Answer 1

Easiest solution is to write the variable to a file, then read it when needed. A simple text file will do the job.
First Script:
writeVar("yes")
tell application "Finder"
shut down
end tell
on writeVar(theVar)
do shell script "echo " & quoted form of (theVar as text) & " > ~/varFile.txt"
end writeVar
Second Script:
if readVar() is "yes" then
tell application "MainStage 3"
activate
end tell
writeVar("no")
end if
on writeVar(theVar)
do shell script "echo " & quoted form of theVar & " > ~/varFile.txt"
end writeVar
on readVar()
do shell script "cat ~/varFile.txt"
end readVar

Answer 2

Save the script below into the ~/Libraries/Script Libraries folder with the name shutdownStore
use AppleScript version "2.3"
use scripting additions
property shutDownCacheName : "shutdownStore"
property shutdownCache : missing value
to saveShutDownStatus(theShutDownStatus)
set cachePath to ((path to library folder from user domain as text) & "caches:" & "net.mcusr." & my shutDownCacheName)
set shutdown of my shutdownCache to theShutDownStatus
store script my shutdownCache in cachePath replacing yes
end saveShutDownStatus
on loadShutDownStatusFromScriptCache()
set cachePath to ((path to library folder from user domain as text) & "caches:" & "net.mcusr." & my shutDownCacheName)
local script_cache
try
set my shutdownCache to load script alias cachePath
on error
script newScriptCache
property shutdown : false
end script
set my shutdownCache to newScriptCache
end try
return shutdown of my shutdownCache
end loadShutDownStatusFromScriptCache
on getShutDownStatus()
set last_shutDownStatus to loadShutDownStatusFromScriptCache()
return last_shutDownStatus
end getShutDownStatus
Use this from your scripts like I have modified them:
First Script:
use AppleScript version "2.3"
use scripting additions
use mss : script "shutdownStore"
set msshutdown to yes
saveShutDownStatus(msshutdown) of mss
tell application "Finder"
shut down
end tell
Second Script:
use AppleScript version "2.3"
use scripting additions
use mss : script "shutdownStore"
set msshutdown to getShutDownStatus() of mss
if msshutdown is yes then
tell application "MainStage 3"
activate
end tell
set msshutdown to no
saveShutDownStatus(msshutdown) of mss
end if