Thanks!  

   docs sounds boring

@Dmitry Maslennikov 
Is this also supported by VSCode?

@Yuri Marx :
if you have the schema as XSD at hands 
All you need to do is to open the XML wizard in IRIS  Studio and it generates the whole packages for you

>>>

I used it rather intensive and a pack of 100+ classes from 1 XSD was no problem

I removed my example on PuTTY. 
It worked by mistake as the local firewall was switched off

If setup correctly it basically works as described by @Alexey Maslov 
and you need to log in separately on the server,
 

Correct.
After 20 years working with CSP since day 2.5 I just don't feel like discussing and explaining CSP internals anymore and argue against obviously wrong statements. 
There is enough public detailed documentation around .

Just post the class. 

the generated file:
------------------------------------------------------------------------------------------
<br><p>
<nobr>Klasse <b>zrcc.EX.ISOS</b>
</nobr><p>Execute InterSystems ObjectScript over ODBC</p><a name="Anchor_Inventory"></a>
<table class="Label" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<td align="left" width="100%" >
<a href="#" onclick="expandIt(1); return false;" class="PackageChoice" title="Expand/Collapse Inventory" onmouseover="this.style.color = 'red';" onmouseout="this.style.color = 'black';">
    <image id=Im1 src=/csp/sys/images/ExpandedMarker.jpg height=15 width=16 border=0 align=bottom>
<nobr><b>Inventory</b></nobr></a>
</td>
</tr>
</table>
<br>
<div id="Id1" class="DivShow" style="">
<table class="Summary" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<th align="center">
Parameters
</th>
<th align="center">
Properties
</th>
<th align="center">
<a href="#Anchor_Methods">Methods</a>
</th>
<th align="center">
Queries
</th>
<th align="center">
Indices
</th>
<th align="center">
ForeignKeys
</th>
<th align="center">
Triggers
</th>
</tr>
<tr>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
<td align="center">
<a href="#Anchor_Methods">3</a>
</td>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
</tr>
</table>
<br/>
<br/></div>
<a name="Anchor_Summary"></a>
<table class="Label" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<td align="left" width="100%" >
<a href="#" onclick="expandIt(2); return false;" class="PackageChoice" title="Expand/Collapse Summary" onmouseover="this.style.color = 'red';" onmouseout="this.style.color = 'black';">
    <image id=Im2 src=/csp/sys/images/ExpandedMarker.jpg height=15 width=16 border=0 align=bottom>
<nobr><b>Summary</b></nobr></a>
</td>
</tr>
</table>
<br>
<div id="Id2" class="DivShow" style="">
<table class="Summary" border="0" cellspacing="0" cellpadding="1">
        <tr><th colspan="3" title="Bold for local member; italics for inherited; shaded for private; blue for client methods; strikethrough for deprecated.">Methoden</th></tr>
<tr>
<td  nowrap><a class="" href="#METHOD_Gset" title="zrcc.EX.ISOS">Gset</a></td>
<td  nowrap><a class="" href="#METHOD_Ping" title="zrcc.EX.ISOS">Ping</a></td>
<td  nowrap><a class="" href="#METHOD_Xcmd" title="zrcc.EX.ISOS">Xcmd</a></td>
</tr>
</table><br/>
<br/></div>
<a name="Anchor_Methods"></a>
<table class="Label" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<td align="left" width="100%" >
<a href="#" onclick="expandIt(3); return false;" class="PackageChoice" title="Expand/Collapse Methods" onmouseover="this.style.color = 'red';" onmouseout="this.style.color = 'black';">
    <image id=Im3 src=/csp/sys/images/ExpandedMarker.jpg height=15 width=16 border=0 align=bottom>
<nobr><b>Methods</b></nobr></a>
</td>
</tr>
</table>
<br>
<div id="Id3" class="DivShow" style="">
<a name="Gset"></a>
<a name="METHOD_Gset"></a>
<span class="external"><nobr>&#149 classMethode <b>Gset(glob As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr>, subs As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr>, val As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr> = "", dd As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25Integer">%Integer</a></nobr> = 1)</b>
as <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr></nobr>
[ SQLProc = Gset ]</span><blockquote>
set / kill global over ODBC
subs = subscript in ( )
dd = $data of source during global copy</blockquote>
<a name="Ping"></a>
<a name="METHOD_Ping"></a>
<span class="external"><nobr>&#149 classMethode <b>Ping()</b>
as <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr></nobr>
[ SQLProc = Ping ]</span><blockquote>
check connectivity</blockquote>
<a name="Xcmd"></a>
<a name="METHOD_Xcmd"></a>
<span class="external"><nobr>&#149 classMethode <b>Xcmd(cmd As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr>, ret As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr> = "")</b>
as <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr></nobr>
[ SQLProc = Xcmd ]</span><blockquote>
eXecute Command over ODBC
name of local variable for return value</blockquote>
-------------------------------------------------------------------------------------------
​​​

Hi @Yuri Marx!
I did a quick and dirty try during lunch in terminal:   

set %library=$namespace
set set %request=##class(%CSP.Request).%New()
set cdef=##class(%ClassDefinition).%OpenId("zrcc.EX.ISOS")     ; my classname
set file="my.html" o file:("WNS"):0 write $t     ;  1 if OK
use file d ##class(%CSP.Documatic).RenderClassPage(cdef,1)
close file

The result still holds references to /csp/...images  and data types  
     <image id=Im1 src=/csp/sys/images/ExpandedMarker.jpg height=. . . 
    <a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a>
that you might want to resolve as they are quite generic or you just ignore it .
My browser is very friendly  :-)
And that's the result:

Some polishing might be required
 

It all sounds like a software provider in maintenance for its customers.
But then, I would connect with Studio (or similar), place my code and run it from the embedded terminal.
 

It might be a hard exercise to manage write access from a local and a remote instance to a common DB at the same time.
 

Hello @Anna Golitsyna!
the 3rd example is 1 class that contains 2 basic functionalities:  A Server and a Client.
The system you want to control runs the ClassMethod Server.
- opens an IP port and listens for orders, execute it, and continue looping.
- it is typically started in the background during  system start (from %ZSTART.mac)
This is the "hidden Login"
The (Classmethod) Client connects to the listening port and sends a request and gets answers.
The structure of Requests and Answer is up to you and makes sure you have always control
over what should happen on the remote system. As your  "Listener" is active already there
is no need for any further login. But you are of course free to implement it on top of this basic mechanic.

I confirm it is easy and works !
Take the screenshot BEFORE submitting.