Hm, somehow i thought you had one.
In simple words - TLA works like logic analyzer, iView scope brings analog waveform into TLA app window, that's it. Scope need to be set in correct horizontal/vertical ranges to capture signal well manually. TLA can trigger external scope (any scope) by BNC output, which can be synced to capture trigger of TLA itself.
Also there few more functions for high-speed signal verification, like iVerify, but that's pretty specific to some usage cases.
There is no other link except this, regarding TLA application and iView. I would not focus too much on specifically buying scope which supports Tek TLA iView.
Most of the time I use TLA just alone, debugging digital stuff. If I need see signal - i'd rather just hook a scope to interested signal and not bother with getting TLA and scope both setup right.
TLA is not really realtime device, it's working differently that usual RT scope. Sample count may way from few hundred samples to 32M like on my hacked TLA7AA4 or even more on modern hi-end modules like TLA7BB4 or 7BC4.
You can download TLA application and play with it a little, it have demo mode when no real mainframe detected.