merging vertices on two blocks

How do you choose the four vertices on each blockfacing one another and then merge the two blocks. This can be seen on page 53 of Allan Brito’s Architectural book. How do you learn these things when the documentation seems void of explaining how to choose vertices on two objects? Maybe I’m missing something in the documentation! Things just don’t seem to be straightforward. Feel free to correct me if I am wrong or maybe recommend a book that better explains modeling in Blender. Sago stated in another thread that you can’t work on the mesh of two objects at the same time but this is not the case in Allan Brito’s book. One vertice on both blocks is chosen, merge is activated and the two corners connect. What option in vertices do you choose to highlight vertices? Thanks!
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I was just reading you other post on this. It’s really not possible to work on two objects at the same time. If you merge vertices on two objects, then wouldn’t it become one object?? You can join to objects (ctrl-j), enter edit mode, select vertices, merge (alt-m), then select all vertices of one object and p-key to separate back into another object.

If anyone knows a better way, please explain…
Randy

Ya, you will have to join the meshes. to seperate again simply press p.

Thanks for the advice. I will try what you’ve written. The picture in the book, although, is deceiving. Once in edit mode do you have to hit a certain function or do you simply right click the mouse over the vertices? Thanks!