A VTAM® application program can specify that RPL-based macroinstructions be executed by VTAM in a manner that generally requires fewer instructions than the normal mode of operation. The path length (number of executed instructions) is significantly decreased for the SEND, RECEIVE, RESETSR, and SESSIONC macroinstructions. This facility, called authorized path, can be used to improve the performance of a VTAM application program. Such an application program must be authorized as described in Assigning operating system authorization. Macroinstructions that can use authorized path are listed in Figure 1. The OPEN, CLOSE, and manipulative macroinstructions cannot use authorized path; they cannot be issued under an SRB, but instead must run under a task control block (TCB mode).

Figure 1. Categories of VTAM macroinstructions versus the authorized path function