I should know this, and may have at one time.  How does Cakewalk handle mono tracks?  Can I use a stereo effect on a mono track and get the stereo effect out?  I usually work with stereo tracks.
 
Thanks in advance!

There are a number of ways to handle this, but the simplest may be to click on the circular icon to change track to stereo.You can also route track to stereo bus and apply effect there.

SONAR/Cakewalk is pretty smart about mixing mono and stereo effects. Basically, it's able to automatically switch between interleaves as needed, even if there are both mono and stereo effects in the chain.
 
The results can be unexpected, however, e.g. losing a ping-pong delay when followed by a mono amp sim. Not all plugins are as smart as CbB; if a vendor offers mono and stereo versions of a given effect, use the appropriate one to avoid surprises.
 
As a general rule, to use stereo effects on a mono track, just set the track interleave to stereo even though the data is mono.
 
Also remember that if a stereo effect is followed by a mono effect, the internal signal will effectively be mono at the output of the latter. So, for example, if you use a mono amp sim and want to hear a stereo ping-pong echo, make sure the amp sim comes first.

I find that Cake normally changes the track stereo interleave setting automatically when for example, adding a stereo amp sim such as guitar rig or amplitube. At least this is what seems to happen if I add one of those and then record a take on that track.
 
Also, +1 to what Bitflipper said above that you have to watch out for how you route plugins making sure any mono plugins come first in the chain then feed into the stereo plugins last otherwise it will be converted back to mono.

If you use the Effects send it sends the mono signal from the track to the Stereo effect. This is the same as it's always been even in the world of analog mixers. 

Great!  Thanks to all.  I do enjoy stereo effects and Cakewalk makes it easy as .. well cake!