PAGE waits for something to be typed at the
keyboard until ENTER is pressed. Everything
that was typed prior to ENTER is stored in
the variable on the dot command line.
Example:
.AV VAR1
A prompt may also be automatically printed
using this syntax:
.AV "Here is the prompt: ",VAR1
.DM (display message) commands may also be
used to display text prior to asking for
keyboard input.