HP(1)			 HP-UX 5.0			 HP(1)

     NAME
	  hp - handle special functions of  HP	2640  and  2621-series
	  terminals

     SYNOPSIS
	  hp [ -e ] [ -m ]

     HP-UX COMPATIBILITY
	  Level:    HP-UX/STANDARD

	  Origin:   System III

     DESCRIPTION
	  Hp supports special functions of the	Hewlett-Packard	 2640-
	  and  2621-  series of terminals, with the primary purpose of
	  producing accurate representations of most nroff(1)  output.
	  A typical use is:

	       nroff -h files ... | hp

	  Regardless of the hardware  options  on  your	 terminal,  hp
	  tries	 to  do	 sensible  things with underlining and reverse
	  line-feeds.	 If   the   terminal   has    the    ``display
	  enhancements''  feature,  subscripts and superscripts can be
	  indicated in distinct ways.  If it has  the  ``mathematical-
	  symbol''  feature, Greek and other special characters can be
	  displayed.

	  The options are as follows:
	  -e   It is assumed that  your	 terminal  has	the  ``display
	       enhancements''  feature,	 and so maximal use is made of
	       the added display  modes.   Overstruck  characters  are
	       presented  in  the  Underline  mode.   Superscripts are
	       shown in Half-bright  mode,  and	 subscripts  in	 Half-
	       bright,	Underlined  mode.  If this flag is omitted, hp
	       assumes	that  your  terminal   lacks   the   ``display
	       enhancements''  feature.	  In this case, all overstruck
	       characters, subscripts, and superscripts are  displayed
	       in Inverse Video mode, i.e., dark-on-light, rather than
	       the usual light-on-dark.
	  -m   Requests minimization of	 output	 by  removal  of  new-
	       lines.	Any contiguous sequence of 3 or more new-lines
	       is converted into a sequence of only 2 new-lines; i.e.,
	       any  number  of	successive blank lines produces only a
	       single blank output line.  This allows  you  to	retain
	       more actual text on the screen.

	  With regard  to  Greek  and  other  special  characters,  hp
	  provides the same set as does 300(1), except that ``not'' is
	  approximated by a right arrow, and only the top half of  the
	  integral  sign  is  shown.   The  display  is	 adequate  for
	  examining output from neqn(1).
     DIAGNOSTICS
	  ``line too long'' if the representation of  a	 line  exceeds
	  1,024 characters.
	  The exit codes are 0 for normal termination, and 2  for  all
	  errors.

     SEE ALSO
	  300(1), col(1), neqn(1), greek(1), nroff(1), tbl(1).

     BUGS
	  An  ``overstriking  sequence''  is  defined  as  a  printing
	  character  followed  by  a  backspace	 followed  by  another
	  printing character.  In such sequences, if  either  printing
	  character  is an underscore, the other printing character is
	  shown underlined or in Inverse Video;	 otherwise,  only  the
	  first	 printing  character is shown (again, underlined or in
	  Inverse Video).  Nothing special is done if a	 backspace  is
	  adjacent  to	an  ASCII  control  character.	 Sequences  of
	  control characters (e.g.,  reverse  line-feeds,  backspaces)
	  can make text ``disappear''; in particular, tables generated
	  by tbl(1) that contain vertical lines will often be  missing
	  the  lines  of  text that contain the ``foot'' of a vertical
	  line, unless the input to hp is piped through col(1).
	  Although some terminals  do  provide	numerical  superscript
	  characters, no attempt is made to display them.