Is it possible to write a X program that enlarges cursors automatically?
Use the XTestCompareCursor from the XTEST extension. For all windows that the mouse pointer enters compare the cursor of this window with a set of `known' cursors (e. g. from the cursor font). If the cursor is found, replace it with an enlarged version, otherwise either leave it alone or substitute a standard cursor. This will only work where the XTest extension is available.
Write a proxy X server that relays all client requests unchanged to the real X server, except that it intercepts all requests corresponing to the
XCreate*Cursor Xlib functions.
XCreate*Cursor requests should be modified to use an enlarged cursor.
This proxy server simulates a new display, e. g.
:1. All clients that connect to this display (e. g.
xterm -display :1) are displayed on the real server (normally
:0) and their mouse cursors are enlarged automatically. The mouse cursors of clients that connect to
:0 will remain unchanged.