APBPs can (should, according to their directives) only log in to watch existing internals or follow up on a lead on an AP TM. However, the group leadership and up will log in a do "virtual visits" to see how well TMs are engaging guests, check on big transitions, or check on issues that may be actively happening.
The IC will log in and look into anything that flags on a report, if any alarms get tripped over night, or if assistance is needed by AP.
I hate it when people log in, use my cameras, then leave them pointed the wrong way -.-
Right before I left they did an update to the software, but you used to be able to log-in to any store you wanted (even as a tps). Worked out handy for the other store in our town. they only had a APL and we had ETL-AP, 4 TPS's and 2 APS's. We ran cameras for them on multiple occasions while they worked the floor. Then they pushed an update that grey'ed out that option when you logged in. Probably against the rules, but we were not much for rules anyway. HAHA.