Description from the author:
"Abstract Introduction
RxSwitchQuery (RxIsRun.DLL) is a small OS/2 Dynamic Link Library (DLL) that interfaces routines for querying the OS/2 system WinSwitchList with REXX.
Querying the WinSwitchList allows you to check if a certain program (OS/2, DOS or Windoze) is running. RxSwitchQuery also allows you to wait for a given application to appear in the WinSwitchList, or for an application to disappear; this is useful in situations where scripts have to be synchronised with running programs.
These functions cannot be made from standard REXX, and resorting to tape-and-glue solutions of repeatedly calling external query programs is a very slow and computionally intensive task. With this easy-to-use and versatile DLL, you can easily and efficiently check for running OS/2, DOS or Windoze programs from your standard REXX programs."