Patchstream uses several different methods to determine the version of software that is installed on a computer being scanned. These are used in the following order:
- For applications that display a version number in the Add/Remove Programs list in control panel, Patchstream uses this version number.
- For applications that have a version number for a specific file in the application (e.g. application.exe) Patchstream uses this version number.
- For applications that have neither of the above, Patchstream will calculate a SHA-1 checksum for a specific file in the application (e.g. application.exe) and Patchstream will use this checksum to test if this file is the latest version known to Patchstream.
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