command makes parallel on 3d sketch

[Alerm]

Good evening to all
I remember that on 3d sketch to parallel a line on the zx axis, or for example xy there is a keyboard command that I can't find.
if I'm not wrong was tab but by clicking it nothing happens
advice?
thanks to everyone as usual

 

[MassiVonWeizen]

the tab command serves to direct the direction of the free sketch, i.e. without constraints with other gemetries.
to ogno tab steps from xy to xz to yz; check the coordinate system.
in the guide: http://help.solidworks.com/2012/italian/solidworks/sldworks/coordinate_system_3d_sketching.htm