Terminal / Web Browser
The Terminal/Web Browser category of the Global Options dialog allows you to choose your default web browser and Telnet Telnet is a protocol that provides an interface for communications between clients and servers. application.
Web browser group
With SecureCRT, you can open a URL by right-clicking on the URL text and selecting Open URL from the pop-up menu. This group allows you to specify which web browser SecureCRT should use for this operation.
Use registry setting for web browser
By default, this option is checked and SecureCRT will open a URL using the default web browser for Windows as defined in the Windows registry. To specify a web browser other than the default browser for Windows, clear this option and enter the full path to the web browser that you want to use or use the Browse button 
to select the browser application..
Use Dynamic Data Exchange ( DDE)
Select this option if you want a new browser window created each time you open a URL with SecureCRT. By default, if the designated web browser is already running, the URL will not be opened in a new browser window. Instead, the running browser application will be brought into focus, and the URL will be opened in that window.
To open a URL with SecureCRT, right-click on the URL text and select Open URL from the pop-up menu. If you have trouble opening a URL or if you want to open a root folder of a URL follow these steps:
1. In the SecureCRT window, select all or part of the URL.
2. Right-click on the selected text.
3. Click on the Open Selection as URL item in the pop-up menu.
For example, suppose that your SecureCRT window displayed the following URL:
http://www.vandyke.com/products/securecrt/index.html
You could open the URL www.vandyke.com by selecting just that text and using the Open Selection as URL command.
Default URL handler
Make SecureCRT your default Telnet application
Click on this button to make SecureCRT the default Telnet application rather than using the Windows Telnet application when it opens a URL of the form:
telnet://...
Make SecureCRT your default SSH1 application
Click on this button to make SecureCRT the default SSH1 application so that SecureCRT is used when a URL of the form below is opened.
ssh1://...
Make SecureCRT your default SSH2 application
Click on this button to make SecureCRT the default SSH2 application so that SecureCRT is used when a URL of the form below is opened.
ssh2://...