How OSDI Functions Match Application Calls

The following table shows the user-modifiable OSDI functions that are triggered when device calls are made from a DP4 C application.

DP4 C Application Call	OSDI Function
dvc_choose()	`prg_start()` `prn_select()` (`prn_parameters()`)
dvc_close()	`prg_stop()`
dvc_set_subdevice()	`prn_select()` (`prn_parameters()`)
dvc_get_status()	`prn_status()`
prn_print() (after calls to DP4 functions such as form(), or prn_c() etc.)	`prn_print()`
dvc_set_inp_mask()	`inp_start()` or `inp_restart()`

The following sections describe the areas of the OSDI that you may modify to handle Device Groups and their constituent PODs and input devices.