Command to change user KDE

Hello community.
I'm looking for a command for KDE where I can start a session in parallel with a different user .. ie, do what makes USER CHANGE menu Option K but from a command.
Does anyone have any idea how can I do?

Using Opensuse 13.1 32 bits with KDE.

Thanks in advance


PD: Sorry for my English ... I'm using the google translator. my native language is Spanish