Powershell - Calling multiple PS1 scripts from batch file keeping same session and global variables

I have several ps1 files:
1.ps1
2.ps1
3.ps1

I have variables that I would like 2 to use which are set by 1.  I can set them global but that makes them available for the same session only.  If I run the scripts via a batch file it creates new sessions for each ps1.  Is there a way to open each ps1 using a single session via a batch file?

inside 1.ps1
$a = 20

inside 2.ps1
write-host $a

copy of current batch:
powershell . c:\powershell\powershellscripts\trial\1.ps1
powershell . c:\powershell\powershellscripts\trial\2.ps1

Thanks again,
C
LVL 11
chadAsked:
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soostibiConnect With a Mentor Commented:
Put the two script call into another script, and call that from batch (I assume that the current path is the path of all the ps1 files):

inside: coll.ps1
. .\1.ps1
. .\2.ps1

batch:

powershell .\coll.ps1
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soostibiCommented:
The extra '.' inside coll.ps1 makes script variables global.
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chadAuthor Commented:
oh bother.  again I get hit with the forest and trees :-)
I was too focused on using the batch file to call all of the ps files.  
Thanks again.
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