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= How to run JOSM from an USB stick (on a Windows system) =
**Run JOSM on a "foreign" Windows machine without installation or a JAVA machine installed on it! **

''[http://www.portableApps.com portableApps] offers a method to install a JAVA machine on an USB stick, so you can run JAVA .jar files on a foreign machine without further installation.
Once this is installed on the stick, you can run a normal josm-tested.jar/josm-latest.jar with it. All personal files (like the settings, plugins) will be stored on the stick. You will need ~140MB free space on your USB stick. 
''

To have your personal JOSM always with you ...


== Stick in your USB stick ==
Ok, this part was easy! :-)


== Download and install the "PortableApps.com Suite" ==
From http://portableapps.com/download download the platform only (3MB) and run the .exe file.

The installer will ask for a target drive, choose your USB stick base directory (in the following, we will assume g:\ is used).


== Download and install "Java Portable" ==
From [http://portableapps.com/apps/utilities/java_portable jPortable] download and run the .exe file.

This installation may take a while.

Please note: The installer will download the Java engine, so you'll need an Internet connection while doing the installation!


== Download and install "Java Portable Launcher" ==
From [http://portableapps.com/apps/utilities/java_portable_launcher jPortable Launcher] download and install the .exe file.


== Download and save "josm-tested.jar" on your USB stick ==
From [wikitr:/Download Download] download the tested JOSM version ([/josm-tested.jar josm-tested.jar]) and save it on your USB stick (e.g. at `g:\josm-tested.jar`)

''You can replace 'josm-tested' with '[/josm-latest.jar josm-latest]' if you like living on the edge. The difference should be self-explanatory - if it isn't, stick with josm-tested.''


== Remove the USB stick == #RemoveUsb
* If you have any applications accessing the content of your USB drive (e.g. explorer showing g:\), close them
* There should be a PortableApps.com icon in your taskbar (usually at the bottom right of the screen), right click on it and choose exit
* Use Windows "Safely remove hardware" to throw out the stick (as usual for USB devices)


== Start JOSM from the stick ==
* Stick in your USB stick
* If autorun is enabled, "Start PortableApps.com" should appear, please start it
* If nothing happens, just start g:\Start.exe directly
* The PortableApps menu should appear, select "Java Portable Launcher"
* Choose josm-tested.jar (in our example at `g:\josm-tested.jar`)
* JOSM should start up as usual

If you've closed JOSM, you can restart it from the PortableApps.com icon in your taskbar.
To remove the stick, close a running JOSM and follow the "Remove the USB stick" instructions as [#RemoveUsb above].


== Preferences, Plugins and alike ==
Essentially you now have a "fresh JOSM installation" on your stick (in parallel to any pre-existing JOSM on the computer).
A JOSM started from the stick will load and save all settings, plugins and alike from/to the USB stick.
Remember to enter your user account, adjust settings and download the required plugins.

In case you want to know, all personal files will go to: `G:\PortableApps\JavaPortableLauncher\Data\AppData\JOSM`

**Have fun with your portable JOSM! **


== See also ==
* [https://wiki.openstreetmap.org/wiki/JOSM/HOWTO/Run_from_flash_disk_with_Java Howto on the OSM-wiki]
* [https://www.openstreetmap.org/user/Otnow/diary/34580 DIY Josm Portable instance on the OSM-diary (ru)]