To return a character form of the offset of a variable in memory.
variable is the name of a variable that exists in the program.
Assign all simple variables before calling VARPTR$ for an array element, because the array addresses change when a new simple variable is assigned.
VARPTR$ returns a three-byte string of the following form:
| Byte 0 | Byte 1 | Byte 2 |
Byte 0 contains one of the following variable types:
8 double precision
Byte 1 contains the 8086 address format, and is the least significant byte.
Byte 2 contains the 8086 address format, and is the most significant byte.
100 X = USR(VARPTR$(Y))