The System 7 Compatibility Checker is a HyperCard stack that scans your hard disk, or any other startup disk, checking the compatibility of third-party:
* Applications
* Startup documents (INITs), known in System 7 as system extensions
* Control Panel documents (cdevs)
* Chooser selectable devices (rdevs)
All compatibility information used by the Compatibility Checker came from the developers of the products. You should use the Compatibility Checker before upgrading to System 7; you can use it afterward as well. Before
using it, however, be sure to check the version and date of the Compatibility Checker itself. If it is out of date, the report it gives you will not contain accurate information about the third-party software on your disk. For instance, if you have just purchased a new version of a spreadsheet application, Compatibility Checker will be unaware of this
version and will report it as incompatible. For the most recent possible information, it is best to contact the vendors of your software directly.