Dear Priya,
1. In SAP there are so many T.codes hope no one can remember.
2. Hope we can't see all T.code in single shot.
3. If your requirement can't be full filled by SAP Standard T.code then SAP Has given option to us like (SAP Query --> SQ03,02,01 & SQVI).
4. Normally every one will look the T.code based on client requirement either Google or SCN mates.
5. Now tell me what is your requirement?
Hope this message can help to you.....!
Ur's Mohan