What is difference between using a command $classmethod rather than just invoking them straight away?

For example if i need to call a class and its method i can just use like

do ##class(circle).radius()

rather than using

do $classmethod("circle",radius)

(I suppose both of them doing the same function i am not aware of it)

Please help me understand what is different and is there any specific usage.

Correct me if i have made mistake.

Set httprequest=##class(%Net.HttpRequest).%New()
	Set httprequest.Server="www.intersystems.com"
	Do httprequest.Get("/")
	Do httprequest.HttpResponse.OutputToDevice()
	Do httprequest.Get("/cache/")
	Do httprequest.HttpResponse.OutputToDevice()

The above is the code which i found in this link http://docs.intersystems.com/latest/csp/documatic/%25CSP.Documatic.cls?P...

I am beginner to ensemble and went through the introduction of ensemble in that they have mentioned three process of operations which is business service,business process, business operations is there anyway to understand these process can anyone help me on this.

Thanks in advance.

Hi!

While i am trying to write a data i am getting a error as "<PROPERTY DOES NOT EXIST>zFile+15^User.zKQRest.1 *value,%Collection.ListOfObj" but there are values stored in it. How can i break it write it separately.

Hi!

In the below code for cls with csp i have passed the output to a global but after i give the content in the text box it is getting stored, but when i check the global it is empty.

Can we use iknow in the Cache tool means if i don't have deepsee tool to work on like for doing some sample programs. Because i don't have deepsee tool with me?

And is there any open source for downloading deepsee?