When AIMMS loads your solver interface DLL, AIMMS will interrogate the DLL for the name of the associated solver and its capabilities. Through a call to the function RegisterAsSolver, AIMMS will interrogate your solver for its name and the model types that it can handle. 

Through the function GetInitialInfo, AIMMS will retrieve further information about the solver such as:

• information about the solver's capabilities for specific model types,
• some basic information about the solver options, and
• the values used by the solver for special numbers (like INF).

The information that AIMMS retrieves during this phase is used to assure that your solver is only called for problems for which it is designed.