While it is possible to input data into PETOOH VM memory in runtime using metacircular evaluation, recent studies show that a special function or operator for inputting data is highly demanded. Here are the most popular proposals:

- “Pok”. The keyword “Pok” which inputs an ASCII character from standard input into a current cell. This is the most demanded feature among developers all over the world.
- “XLS”. The keyword “XLS” which reads Microsoft Excel spreadsheet into VM memory. XLS spreadsheets are de facto industry standard for reporting and is highly demanded by Enterprise Edition customers.
- “pok“. Automatically applied lambda named “pok” translating standard input's first character into a current cell's value. This feature is especially demanded by developers and computer scientists in India and Pakistan.
- Prepopulated. Virtual machine memory populated with specified data on VM startup. Enterprise Edition customers also would like to have Microsoft Excel spreadsheets parsing functions provided in standard library.
- “kukarek”. Standard library function “kukarek” which gets the current VM state and returns a new VM state with the current cell changed to the next byte from UNIX stdin.
While it is possible to input data into PETOOH VM memory in runtime using metacircular evaluation, recent studies show that a special function or operator for inputting data is highly demanded. Here are the most popular proposals: