A complete newbie question this (I'm familiar with Logix500/5000 but totally new to GX Developer & its friends). When I add or edit aninstruction, up pops a little dialog box for me to choose/change the instruction type and type in the register/address/label/variable (whatever the appropriate terminology is in GX-speak). 2 questions: 1) What does the little button to the left of the instruction type drop-down do? When I click on it it changes but appears to do nothing else. 2) More importantly... instead of having to maintain list of all my labels (etc) in my head, or elsewhere on the screen, can I make it pop up a list to select from? Thanks, Mike