epsg help

[soares]

hi all!!

i have a shapefile i need to know the epsg code for acessing it via wms,
when i open it in arcMap i retrived the following information:
------------------------------------------------------------------------------------
------------------------------------------------------------------------------------
Projected Coordinate System: Lisboa_Hayford_Gauss_IGeoE
Projection: Transverse_Mercator
False_Easting: 200000,00000000
False_Northing: 300000,00000000
Central_Meridian: -8,13190611
Scale_Factor: 1,00000000
Latitude_Of_Origin: 39,66666667
Linear Unit: Meter (1,000000)

Geographic Coordinate System:
GCS_Datum_Lisboa_Hayford
Datum: D_Datum_Lisboa_Hayford
Prime Meridian: 0
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but how can i get or define the epsg code??
can i set the projection i any other way in the Mapfile,i.e. not with epsg??
tkx for any information
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