Normal free text discussion is in a proportional font, typically Times Roman.
Any line that starts with punctuation or contains more than two contiguous space characters uses a mono font (a.k.a. fixed font), typically Courier. This is to facilitate the display of lists, schematics, pseudo-window displays, etc.
Titles are bold.
Text fields and other objects (radio buttons, push buttons, etc.) report some attributes (character length, mandatory, tab stop, etc.,) in an italicized font.
Field and object attributes selection choices use a second mono font.
A Window image appears either as a bitmap graphic or a character text display enclosed in a box of character lines such as:
-----------------------------------
| Window Title |
| |
| Field Label: ___________ |
| |
| [ ] Check Box Object |
| |
| ( ) Radio Button Object |
| |
| [Push Button Object] |
| |
-----------------------------------
Numbers may appear on or near the objects. These numbers
correlate to the textual documentation which follows the window
display.