-= Info about application 'ChanIsAvail' =- 

[Synopsis]:
Check if channel is available

[Description]:
  ChanIsAvail(Technology/resource[&Technology2/resource2...]): 
Checks is any of the requested channels are available.  If none
of the requested channels are available the new priority will be
n+101 (unless such a priority does not exist or on error, in which
case ChanIsAvail will return -1).
If any of the requested channels are available, the next priority will be n+1,
the channel variable ${AVAILCHAN} will be set to the name of the available channel
and the ChanIsAvail app will return 0.
${AVAILORIGCHAN} is the canonical channel name that was used to create the channel.
${AVAILSTATUS} is the status code for the channel.