In the process of importing a transport request within an SAP system, several tools and programs are involved to ensure a smooth and accurate import. The 'tp' program (A) is the primary tool for handling transports, which includes importing transport requests into an SAP system. 'R3trans' (C) is another essential tool that executes the actual transport process at a lower level, based on instructions from 'tp'. The 'RDDIMPDP' program (D) is a dispatcher program that is responsible for managing background jobs for the import process, ensuring that the necessary resources are allocated for the transport import. 'R3load' (B) is typically involved in system copy or migration tasks rather than the routine transport import process, and 'RDDNEWPP' (E) is not a standard tool used in the import process of a transport request.