I'm using Power Builder Version 2019 R2 Build 2328 and Power Server (PB Edition) 2020 Build 2323.00.

I would like to open a new tab with a URL from the browser where the application is launched.
If the application is launched from Chrome, then it should open a new tab in same chrome browser instance.
If the application is launched from IE, then it should open a new tab in same IE browser instance.
Same for any other browsers (Firefox, Edge).

If I use run command to run explorer.exe or chrome.exe, it will just open a new instance of the browser.
But I need to open a new tab in current browser instance.
Can you share sample code if it can be done?

Also, is there a way to determine the browser type in which the application is launched? (Eg Chrome or IE or Opera etc)

Not really helpfull, but things to think of:

I would say that it depends on your browser configuration if a new page is opened in a new tab on the same browser window or not.

To determine which browser is set as default browser you normally would be able to get that information from the registry, but microsoft keeps changing it and besides ... if you are on powerserver you are either using the registry from the server or using an emulated user copy of a registry, but you have to set the values for that emulated registry from code.

I'm afraid I can't be of more help,

regards.