Window List Manager

Available WLM Modes:
 * WLM - Retrieve list of visible list entries
 * WLM /inv - Retrieve list of visible and invisible entries (Show All)
 * WLM  - Remove a visible entry by HSWITCH number
 * WLM  - Put an invisible entry back on the list
 * WLM /ra - Remove all visible entries in the list (Remove All)