blender 2.67 - Multiple selection in Edit mode

how to select two different meshes in the same scene? After selected I want to join two vertices on both meshes with J, seems to be simple but I am struggling to find in this forum and in google and can not find help. If I select in the outliner turns Object Mode, if click on TAB goes to Edit Mode but I can not select the second mesh vertice only one mesh can be selected at a time. :( What Am I doing wrong?...Read more