The Excel function: REGISTER.ID
Returns the register ID of the specified dynamic link library (DLL) or code resource that has been previously registered. If the DLL or code resource has not been registered, this function registers the DLL or code resource and then returns the register ID.
REGISTER.ID can be used on worksheets (unlike REGISTER), but you cannot specify a function name and argument names with REGISTER.ID.
For more information about DLLs and code resources and data types, see Using the CALL and REGISTER functions.
Note Because Microsoft Excel for Windows and Microsoft Excel for the Macintosh use different types of code resources, REGISTER.ID has a slightly different syntax for each operating environment.