I can go through projects and do the following: right-click-->Properties-->C/C++-->General-->Additional Include Directories, and add the directories I wish.
However, there is an "inherited values" section on that dialog. I'd like to set a bunch of include and lib directories, pre-processor defines, and libraries to link to for the entire solution at once. I would have thought this would be a tab on the solution's properties but it isn't.