Meshing adjacent volumes
 

How can one mesh two adjacent volumes, which share portion of a face (complete face of one volume and portion of the face of the other). When I try to connect these two faces, I get message that "The call to connect on list of faces resulted in no actual connect operations." If I don't do connect, each face is meshed independently, resulting in disjointed mesh.

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split face (the biggest one) with the smallest one.
You can check the connectivity with the icon at the bottom, next to the examine mesh icon (with the 3 colors blue, green, red)
The volume should appear in blue, the smallest surface (interface between the 2 connected volumes ) in pink

You could also unite the two volumes.

Thank you for the help -mAx. It is really mind-boggling how this never got mentioned in the manual. For all practical purposes manual is almost useless.

To dmorian: Thanks for the tip, but I need these volumes to be all of different materials, so uniting them is not an option.