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MEMORYSIZE
Action
Returns memory statistics, in Megabytes.

Syntax
MEMORYSIZE (type)

Parameter
Type
Optional number, indicating the type of memory you want statistics on. Possible values: 

0	Total physical memory (default)
1	Available physical memory
2	Total size of pagefile
3	Available space in pagefile

Returns
The amount of memory, in Megabytes.

Example
$x = MemorySize()
This is from the 4.21 manual.
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