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.
AreaCode.org is your one-stop site for area code lookup, area code search, and area code locator. Area code 877 is one of the area codes reserved for toll-free calls in which the calling party is not charged. Instead, the telephone carrier charges the cost of the call to the called party.reaCode.org is an area code finder with detailed information on the 877 area code including 877 area code map. Major cities like Toll Free Service within area code 877 are also listed on this page.