myDSL Extensions (deprecated) :: Themes in USB stick

Hello i use DSL and it's fine but i want change my themes ( i use USB booting ) it's possible?

And i Want install Apps on My Stick it's Possible?

Thx

I'm French sorry for my english

Yes

Use the backup/restore fucntion to save your themes.

Applications can be stored on your device. Place any application *.dsl, *.tar.gz, *.uci extension files either in the top level directory of your USB device or you can also place them in a directory called "/optional" or "D:\optional" for applications that are used infrequently.

original here.