Hi Vinay,
For the mentioned use-case, you can use the GetBroswer Client Function/action referencing from the OutSystemsUI module as shown below.
Go To Manage Dependencies > OutSystemsUI > GetBrowser
Expression value
GetBrowser(GetUserAgent())
For UserAgent value you can use the GetUserAgent() built-in function.
For server-side check, you can refer the GetUserAgent server action from the HTTPRequestHandler module as shown below
Refer this link: GetUserAgent

You can also refer to the below-mentioned post as well:
https://stackoverflow.com/questions/19999388/check-if-user-is-using-ie
https://www.outsystems.com/forums/discussion/18848/how-does-one-determine-the-current-browser-the-user-uses/
Hope this helps you!
Kind regards,
Benjith Sam