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.
SMTP protocol: smtps (port 465) v. msa (port 587). Ports 465 and 587 are intended for email client to email server communication (sending email). Port 465 is for smtps-SSL encryption is started automatically before any SMTP level communication. Port 587 is for msa-it is almost like standard SMTP port.MTP protocol: smtps (port 465) v. msa (port 587). Ports 465 and 587 are intended for email client to email server communication (sending email). Port 465 is for smtps-SSL encryption is started automatically before any SMTP level communication. Port 587 is for msa-it is almost like standard SMTP port.