a.k.a. pop-up window

A new window that suddenly appears on your computer screen is referred to as a "pop-up window."

You'll see one, for example, when you open a new program, when you switch from program to program (that's multitasking), and when you use a drop-down menu. Likewise, a Web browser may launch a second browser that pops-up in the form of a mini-window on your computer screen. If you don't want it there, just click on the X in the upper-right corner and close it ;-)

The NetLingo Pocket Dictionary on NetLingo.com is an example of something that pops-up.

See also : frames  interstital  pop-up ad  window  
NetLingo Classification: Online Business