Global variables are used to access system values (e.g. the touch coordinates) and to change the behaviour of some procedures. Global constants represent system specific values, e.g. the PV model used. Constants can be used in directives so it is possible to develop different platform-specific solutions for the same task.

Constant	Explanation
#FLOATSIZE	Size of a Float variable in Integer units (PV-S1600: 2, other PV models: 4)
#INTSIZE	Size of an Integer variable in bytes (PV-S1600: 4, other PV models: 2)
#JUMPBUFSIZE	Size of an array needed for JUMP/ SETJUMP% (PV-S1600/other PV models: 2)
#NULL	Symbolic constant that represents the numerical value 0. Use in pointer assignments
#OWBVERSION	Current OWBasic version
#PVMODEL	Current PV model

Variable	Explanation
TCHX	X touch coordinate
TCHY	Y touch coordinate
ERROR	Specifies the number of the error occured before. If no error occured, ERROR is 0
INPUTRC	Specifies the button the INPUT dialogue was left with (-> INPUT)
PARAMETER$	Specifies the parameter the program was called with
FORMSTRINGS$	Contains the form button captions. The main value of the button selector corresponds with the array index.
ERRORHANDLER	User-defined error handling
EXITHANDLER	User-defined exit handling
PVMODEL	Current PV model (obsolete; use #PVMODEL instead)
OWBVERSION	Current OWBasic version (obsolete; use #OWBVERSION instead)