The INFNC program selection input will not go to the selected program immediately. The INFNCi-aP will put the selected programs in a queue and would not interrupt the current program.
The ONIN command would interrupt the current program, and the ONP command would enable GOSUB to the selected program immediately, except for the following conditions/commands:
-Wait command (WAIT)
-Time delay command (T)
-Motion commands (GO, GOWHEN, GOL, HOM, JOY, JOG, PRUN, COMEXC0)
-While a program is being defined (DEF)
-While a data is being read (DREAD, DREADF, READ)
-Pause command (PS)