Switch from Contributor to Viewer

It' s possible to switch (on the same PC) from Contributor toViewer whitout rebooting the computer ?
Could be a "Plus" the possibility to link the user with the CADEditor, Contributor or Viewer versions without a PC reboot.
Another idea could be a login window with a short selection menuCAD,Conttributor,Viewer.
ThanksSolidworksSolidworks Pdm enterprise Pdm