Allowing multiple instances of PuTTYPortable

I know what putty portable currently do is back up the existing registry key

HKEY_CURRENT_USER\Software\SimonTatham\PuTTY

to a different location, then imports its own.

What if putty portable utilize a lock file, so that it knows another copy is running and not do anything to the registry keys (backup and import). The last instance that exits save the registry, and remove lockfile.

This is what I do using a batch file (e.g. myputty.bat):


@echo off
if not exist myputty.lock goto iamfirst
goto startandrelease
:iamfirst
echo 1 > myputty.lock
regedit /s putty_clearsessions.reg
regedit /s myputty.reg
echo DO _NOT_ CLOSE THIS WINDOW
putty-0.60.exe
regedit /ea new.reg HKEY_CURRENT_USER\Software\SimonTatham\PuTTY
del myputty.reg
rename new.reg myputty.reg
regedit /s putty_clearsessions.reg
del myputty.lock
goto end
:startandrelease
start putty-0.60.exe
rem pause
:end


putty_clearsessions.reg contains this:


REGEDIT4

[-HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions]


The bad thing about this batch file implementation is that the first instance carry around a cmd.exe window Ugly!