Workspace: How do I run a server script or sub flow from a landing page?

[Per5]

I want to add button to a Workspace landing page in . When pressed, some records should be updated. 

How do I do this?

When using an UI Action in workspace, I can use GlideAjax to call a script include.

The issue is that GlideAjax is not recognized when I try to use it in a Client Script for a landing page.

I have added Data Resources to look up records, but I don't find any methods to update records.

[Per5 · Accepted solution]

I figured it out. 
I have missed the global data resources for creating/updating records.