Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank´s for your help, I already recived these manual from you
Text excerpt from page 22 (click to view)
HOW TO USE THE REMOTE TO CONTROL YOUR TV
LAST CHANNEL (LAST CH) button Use this button to select between the last two channels viewed. (Good for watching two sporting events, etc.)
Ant A 10
Ant A 39
LAST CH
PIP CH button Use the PIP CH button to select between main picture and sub-picture tuning. The channel number which is highlighted indicates which channel is being controlled. MENU button The MENU button will start the On-Screen Display.