To display Polish letters in HTML put:
<META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=Windows-1250">
within the <head> section of the page.
In emacs type:
In emacs use ^Q-octal-code Enter to enter letter with an accent, e.g., a ogonek is ^Q-261. The list Polish letters in the MS Windows encoding (popular in Poland) is the following:
oct  dec  hx  c  name
245  165  a5    A ogonek
271  185  b9    a ogonek
312  202  ca    E ogonek
352  234  ea    e ogonek
243  163  a3    L /
263  179  b3    l /
321  209  d1    N '
361  241  f1    n '
323  211  d3    O '
363  243  f3    o '
214  140  8c    S '
234  156  9c    s '
217  143  8f    Z '
237  159  9f    z '
257  175  af    Z .
277  191  bf    z .

=====================================================

The codes in Latin-1, which you will usually see in Netscape (default) are:
 oct  dec hx  c   name
 40   32  20  _  space (SP)
 41   33  21  !  exclamation mark
 42   34  22  "  quotation mark
 43   35  23  #  number sign
 44   36  24  $  dollar sign
 45   37  25  %  percent sign
 46   38  26  &  ampersand
 47   39  27  '  apostrophe
 50   40  28  (  left parenthesis
 51   41  29  )  right parenthesis
 52   42  2a  *  asterisk
 53   43  2b  +  plus sign
 54   44  2c  ,  comma
 55   45  2d  -  hyphen, minus sign
 56   46  2e  .  full stop
 57   47  2f  /  solidus
 60   48  30  0  digit zero
 61   49  31  1  digit one
 62   50  32  2  digit two
 63   51  33  3  digit three
 64   52  34  4  digit four
 65   53  35  5  digit five
 66   54  36  6  digit six
 67   55  37  7  digit seven
 70   56  38  8  digit eight
 71   57  39  0  digit nine
 72   58  3a  :  colon
 73   59  3b  ;  semicolon
 74   60  3c  <  less-than sign
 75   61  3d  =  equals sign
 76   62  3e  >  greater-than sign
 77   63  3f  ?  question mark
100   64  40  @  commercial at
101   65  41  A  capital letter A
102   66  42  B  capital letter B
103   67  43  C  capital letter C
104   68  44  D  capital letter D
105   69  45  E  capital letter E
106   70  46  F  capital letter F
107   71  47  G  capital letter G
110   72  48  H  capital letter H
111   73  49  I  capital letter I
112   74  4a  J  capital letter J
113   75  4b  K  capital letter K
114   76  4c  L  capital letter L
115   77  4d  M  capital letter M
116   78  4e  N  capital letter N
117   79  4f  O  capital letter O
120   80  50  P  capital letter P
121   81  51  Q  capital letter Q
122   82  52  R  capital letter R
123   83  53  S  capital letter S
124   84  54  T  capital letter T
125   85  55  U  capital letter U
126   86  56  V  capital letter V
127   87  57  W  capital letter W
130   88  58  X  capital letter X
131   89  59  Y  capital letter Y
132   90  5a  Z  capital letter Z
133   91  5b  [  left square bracket
134   92  5c  \  reverse solidus
135   93  5d  ]  right square bracket
136   94  5e  ^  circumflex accent
137   95  5f  _  low line
140   96  60  `  grave accent
141   97  61  a  small letter a
142   98  62  b  small letter b
143   99  63  c  small letter c
144  100  64  d  small letter d
145  101  65  e  small letter e
146  102  66  f  small letter f
147  103  67  g  small letter g
150  104  68  h  small letter h
151  105  69  i  small letter i
152  106  6a  j  small letter j
153  107  6b  k  small letter k
154  108  6c  l  small letter l
155  109  6d  m  small letter m
156  110  6e  n  small letter n
157  111  6f  o  small letter o
160  112  70  p  small letter p
161  113  71  q  small letter q
162  114  72  r  small letter r
163  115  73  s  small letter s
164  116  74  t  small letter t
165  117  75  u  small letter u
166  118  76  v  small letter v
167  119  77  w  small letter w
170  120  78  x  small letter x
171  121  79  y  small letter y
172  122  7a  z  small letter z
173  123  7b  {  left curly bracket
174  124  7c  |  vertical line
175  125  7d  }  right curly bracket
176  126  7e  ~  tilde
240  160  a0  _  no-break space (NBSP)
241  161  a1    inverted exclamation mark
242  162  a2    cent sign
243  163  a3    pound sign
244  164  a4    currency sign
245  165  a5    yen sign
246  166  a6    broken bar
247  167  a7    paragraph sign, section sign
250  168  a8    diaeresis
251  169  a9    copyright sign
252  170  aa    feminine ordinal indicator
253  171  ab    left angle quotation mark
254  172  ac    not sign
255  173  ad    soft hyphen (SHY)
256  174  ae    registered trade mark sign
257  175  af    macron
260  176  b0    ring above, degree sign
261  177  b1    plus-minus sign
262  178  b2    superscript two
263  179  b3    superscript three
264  180  b4    acute accent
265  181  b5    micro sign
266  182  b6    pilcrow sign
267  183  b7    middle dot
270  184  b8    cedilla
271  185  b9    superscript one
272  186  ba    masculine ordinal indicator
273  187  bb    right angle quotation mark
274  188  bc    vulgar fraction one quarter
275  189  bd    vulgar fraction one half
276  190  be    vulgar fraction three quarters
277  191  bf    inverted question mark
300  192  c0    capital letter A with grave accent
301  193  c1    capital letter A with acute accent
302  194  c2    capital letter A with circumflex accent
303  195  c3    capital letter A with tilde
304  196  c4    capital letter A with diaeresis
305  197  c5    capital letter A with ring above
306  198  c6    capital diphthong A with E
307  199  c7    capital letter C with cedilla
310  200  c8    capital letter E with grave accent
311  201  c9    capital letter E with acute accent
312  202  ca    capital letter E with circumflex accent
313  203  cb    capital letter E with diaeresis
314  204  cc    capital letter I with grave accent
315  205  cd    capital letter I with acute accent
316  206  ce    capital letter I with circumflex accent
317  207  cf    capital letter I with diaeresis
320  208  d0    capital Icelandic letter eth
321  209  d1    capital letter N with tilde
322  210  d2    capital letter O with grave accent
323  211  d3    capital letter O with acute accent
324  212  d4    capital letter O with circumflex accent
325  213  d5    capital letter O with tilde
326  214  d6    capital letter O with diaeresis
327  215  d7    multiplication sign
330  216  d8    capital letter O with oblique stroke
331  217  d9    capital letter U with grave accent
332  218  da    capital letter U with acute accent
333  219  db    capital letter U with circumflex accent
334  220  dc    capital letter U with diaeresis
335  221  dd    capital letter Y with acute accent
336  222  de    capital Icelandic letter thorn
337  223  df    small German letter sharp s
340  224  e0    small letter a with grave accent
341  225  e1    small letter a with acute accent
342  226  e2    small letter a with circumflex accent
343  227  e3    small letter a with tilde
344  228  e4    small letter a with diaeresis
345  229  e5    small letter a with ring above
346  230  e6    small diphthong a with e
347  231  e7    small letter c with cedilla
350  232  e8    small letter e with grave accent
351  233  e9    small letter e with acute accent
352  234  ea    small letter e with circumflex accent
353  235  eb    small letter e with diaeresis
354  236  ec    small letter i with grave accent
355  237  ed    small letter i with acute accent
356  238  ee    small letter i with circumflex accent
357  239  ef    small letter i with diaeresis
360  240  f0    small Icelandic letter eth
361  241  f1    small letter n with tilde
362  242  f2    small letter o with grave accent
363  243  f3    small letter o with acute accent
364  244  f4    small letter o with circumflex accent
365  245  f5    small letter o with tilde
366  246  f6    small letter o with diaeresis
367  247  f7    division sign
370  248  f8    small letter o with oblique stroke
371  249  f9    small letter u with grave accent
372  250  fa    small letter u with acute accent
373  251  fb    small letter u with circumflex accent
374  252  fc    small letter u with diaeresis
375  253  fd    small letter y with acute accent
376  254  fe    small Icelandic letter thorn
377  255  ff    small letter y with diaeresis
Check also: