cb Data Structures

Here are the data structures with brief descriptions:

_cbsictx	Context for the serial port information callback
_cbsientry	One configuration entry in the list of entries set in the serial port information callback
_config	Present configuration of the program
_gpscbcontrols	Window handles of controls to fill with current coordinates
_gpsctx	Context structure for the gps callback
t_cbgps	Type for the handle of the GPS reading job
t_cbgpx
t_cbserinfo	Handle for cbserinfo() and cbserinfo_stop()
t_cbserparam	Describes a serial port parameter
t_comport	Handle of the comport

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