humanescape are you sure? I've been programming in html for quite some time now, and target blank always opens in a new tab in my experience.
could you be a bit more constructive with the reply please?
Yes. Since you have been programming html for along time, you must be aware that html acts VERY differently on different browsers and settings.
Apparently one solution (I have not tried it) is adding to links style="target-new: tab;" . . . but if a user has there settings to force a new window instead of a tab I am not sure if that would fix that.
You need to find out what browsers / versions / settings are people using when the window is being opened in a new window vs. tab.
On-top of that, if you concern is a pop-up blocker...a pop-up blocker can block new tabs, not just new windows.
EDIT: Just to throw it out there, one of my apps in both IE 9 and Chrome open in a new tab, not a new window for me (I have not changed any of my settings of course). Perhaps you could post the app that is giving you issues?