The gadget text defines the arexx host name and the functions available. Hostname should be all capitals, function names should not contain spaces. The first function is FID 0, the second FID 1, ...
slot
This switch causes a slot number to appended to the host name. TESTHOST would become TESTHOST.1 or TESTHOST.2 ect.
Arexx definition Reply
----------------------
When the ARexx object creation is successful the pipe replies with
'ok HOSTNAME'
NOTE only one arexx host can be defined for each GUI window.
Additional info
---------------------
To have a arexx host with no GUI window, set the NoWindow switch in the window definition. See the window docs for more information.