Obtain PlayIt version number

=> | /no parameters/

<= | R0 = | version number*100 (eg 2.32 returns 232)

Simply returns the version number of PlayIt so that applications can check that a suitable version is running. It is recommended that applications reject versions with a major version number different from the one the program was designed for. eg if facilities introduced in 2.32 are required then action should be taken if version < 232 or version >= 300. If PlayIt's SWI interface should ever get a major overhaul then a new major version number will be used and programs expecting the old format can reject it if the above recommendation is used.

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