User might just execute one transaction/program but STAD might display many entries for that single transaction/program  each entryis a dialog step in SAP term. How many dialog-steps are displayed under a transaction/program is related to program/transaction design and how that transaction is executed.
Connections of the types TCP, ISO-on-TCP, UDP, ISO and S7 connection are configured in the SIMATIC Manager in NetPro. These connections are configured in the same way in STEP 7 (TIA Portal). In STEP 7 (TIA Portal) the S7 connections have to be configured in the Devices and Networks editor, in the Network view.
When HSRP is configured on a network or segment, it provides a virtual Media Access Control (MAC) address and an IP address that is shared amon g a group of configured routers. HSRP allows two or more HSRP-configured routers to use the MAC address and IP network address of a virtual router.onfiguring an IP address always overrides another designated address currently in use. When the standby ip command is enabled on an interface and proxy ARP is enabled, if the interfaceâs Hot Standby state is active, proxy ARP requests are answered using the Hot Standby group MAC address.