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= Preferencias > Complementos =

Los complementos extienden la funcionalidad básica de JOSM. La [wiki:Plugins lista de complementos JOSM] explica qué complementos están disponibles y con qué tipo de funcionalidad ellos extienden JOSM.

La mayoría de usuarios de JOSM no trabajan con el simple núcleo JOSM solamente. Ellos por lo general instalan en sus sistema de por lo menos 3-5 complementos, incluyendo los importantes complementos wmsplugin y validator.

== Instalando complementos ==
 1. Launch the  '''Preferences''' dialog
 2. Select the tab '''Plugins'''
 3. Click on '''Download list''' do download the list of available plugins
 4. Tick the checkbox for every plugin you want to install
 5. Click on '''Update plugins'''

JOSM will download and install the plugins. You have to restart JOSM to '''load and activate''' the newly downloaded plugins. 

== Manually updating plugins ==
 1. Launch the  '''Preferences''' dialog
 2. Select the tab '''Plugins'''
 3. Click on '''Download list''' do download the list of available plugins
 4. Tick the checkbox for every plugin you want to update
 5. Click on '''Update plugins'''

JOSM will download and install the most recent version of the selected plugins. You have to restart JOSM to '''load and activate''' the newly downloaded plugins. 

== Automatically updating plugins == #AutomaticUpdate
JOSM checks at startup whether the currently active plugins should be updated. JOSM attempts to update the plugins
* if JOSM itself has been updated since the last plugin update. This is called the '''version based update mode'''.
* if a certain periode of time has elapsed since the last plugin update. This is called the '''time based updated mode'''.

In the preferences you can define the policy for updating plugins in version or time based mode.

 1. Launch the  '''Preferences''' dialog
 2. Select the tab '''Plugins'''
 3. Click the tab '''Plugin update policy'''

Select the radio button '''Ask before updating''' if JOSM shall ask before updating plugins in version and/or time based update mode.
Select the radio button '''Always update without asking''' if JOSM shall automatically update plugins without asking. 
Select the radio button '''Never update''' to disable version or time based automatic update. JOSM will skip automatic update at startup if this policy is selected. 

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