APM clientless inquiry

When you say Clientless, what do you mean?

Clientless-mode refers to how the APM session is setup. When you use clientless-mode, APM doesn't send back HTTP redirects to the client and proxies the Authentication attempt - typically this is used for server-to-server type traffic flows or Bespoke client to APM authentication flows.

However, the term clientless can also mean access to the APM policy via a browser rather than using the full-fat client - BIG-IP Edge Client for instance.

If you are referring to the latter, then this is concerned about how the user initiates an APM session. Unless you have specific logic in your APM policy to handle these connections differently then functionality is broadly the same. In that, both client type can access APM resources - Portal, Network, RDP etc - it's just the means that the user has connected is different.