You often see questions related to Siebel because it is a very correlation intensive protocol and the vast majority of users of LoadRunner are weak in this core foundation mechanical tool skill, the collection of dynamic data and presentation back into the script.
Siebel uses a structure called the Siebel Star array, which is substantial in size and requires correlation for proper handling of the Seibel web client. Siebel has available a correlation library which can handle a good portion of the Star Array challenges, but manual skills are still required on top of this to manage dynamic elements which are outside of the star-array structure. It is my understanding that Siebel charges for the use of this library, so if one is technically competent with correlation then you should be able to construct your own correlation rules to handle repeated Siebel script development activities.