The declaration of SVERSIONS:
struct VERSIONS { double lVersion; double hVersion; };
lVersion - the low version of something. (The lowest version of a program that something (a plugin) can operate with). hVersion - the high version of something. (The highest version of a program that something (a plugin) can operate with).
SVERSIONS is only used twice. It is used to store the highest and lowest version of Hackman that the plugin can operate with. It is also used to store the highest and lowest version of DLL Deity that the plugin can operate with.