.WAIT FOR EXISTENCE OF FILE: PIC001
[Enter name of file which you want to wait for. The file may be a non-SPIDER file or a SPIDER image file. This operation does NOT work with an image in a SPIDER image stack, an inline SPIDER "file", or an image in an inline SPIDER image stack "file". If the file does not exist, the system will query its existence until it exists or till the maximum wait time has been exceeded.
.DELAY INTERVAL AND MAXIMUM WAIT(<0 --> NO ERROR): 1,360000
[Specify the seconds for delay between queries and the maximum overall wait time. The default values are 1 second delay between queries for a maximum wait of 9999999 seconds. If "MAXIMUM WAIT > 0" SPIDER will throw an error and will stop if not in interactive mode. If "MAXIMUM WAIT <0" SPIDER return the waiting time in the optional command line register and continue in both procedural and interactive mode.]