Given a list of local files, this function determines which files are different from the corresponding versions in the source code control database.
[in] The source control plug-in context pointer.
[in] A handle to the IDE window that the source control plug-in can use as a parent for any dialog boxes that it provides.
[in] Number of file names specified in the lpFileNames array. Also specifies size of plIsFileDifferent array.
[in] Array of local file names to check.
[in, out] Array of values indicating the difference status of each file (array must have at least cFiles entries). Nonzero means that the file is different.