OK..... I\'ve done all the reading on related questions, and a few MSDN articles, and about a day\'s worth of googling.
What\'s the current \"state of the art\" answ
As long as they ALL use the exact same version of runtime DLLs, there should be no problem with STL. But once you happen to have several around, they will use for instance different heaps - leading to no end of troubles.