Some users have their systems configured with two or more monitors in what is called DualView (see below for more on this). In this mode it is possible, for example, to view the tex source on one monitor and the typeset preview on another monitor. PCTeX can be configured to do this, as explained below.
First, you must configure your computer with your Windows desktop extended across multiple displays, called DualView --- see here (http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/display_multi_monitors_overview.mspx) for how to set this up in Windows XP.
Next, you'll need to resize PCTeX to span as much of your desktop as you want to use with PCTeX documents:
A popular configuration is to place the editor window in the main or left-hand monitor, near the menus and typeset button, and position a typeset preview window in the right-hand monitor.
Note that PCTeX is a Multiple Document Interface (MDI) application. This means that all of the child windows, like your editors, DVI previews, etc. need to live inside PCTeX's client area. The client area is the portion of the main window with the gray background. In exchange for the more powerful interaction between child windows and the parent application with this layout, all child windows must reside "inside" the containing client area - and can't be independently pulled outside to another monitor.
Other programs that deal with very simple documents (like Acrobat Reader) use the Single Document Interface (SDI). In this model, every window is a top-level window, and can be moved independently of all others. This simpler, less powerful interface does have the benefit that it interacts nicely with multiple monitors.