Suppose your document consisted of 100 windows, and you wanted only one window to display push buttons in the control area of the IPF text window. The ctrlarea= attribute of a heading tag specifies which control area in a window you want to display push buttons. You would tag your source file as follows:

:docprof ctrlarea=none.
.
.
.
:h1 ctrlarea=page.One Window

When ctrlarea= is encountered in a heading tag, it overrides the ctrlarea= attribute specified by :docprof..